Hypothenar eminence:It consists of the flexor digiti minimi brevis, the abductor digiti minimi brevis, and the opponens digiti minimi. The splenius muscles originate at the midline and run laterally and superiorly to their insertions. It inserts onto the ulnar aspect of the 5th proximal phalanx. These insert into the 2nd - 5th proximal phalanges. These different roles can be described as agonists (or prime movers), antagonists, or synergists. The information we provide is grounded on academic literature and peer-reviewed research. The posterior muscles of the neck are primarily concerned with head movements, like extension. Here I discuss an alternative way to learn muscles and their origin(s), insertion(s), and action(s).Key Takeaways. It may seem strange that it is included in the anatomy of the upper limb. However, the scapula is integral to the movement of the shoulder via the rotator cuffand additional muscles. Because the muscles insert in the skin rather than on bone, when they contract, the skin moves to create facial expression (Figure 11.4.1). origin: tip of the coracoid process A FOSH may fracture the bone. It has three heads: long, lateral, and medial. The Tissue Level of Organization, Chapter 6. Inferior dislocations are the least common and make the upper limb appears as if you are holding your upper limb upwards. As the muscles pass anteriorly to the MP joints and insert they cause flexion of the MP joint and extension of the IP joints. Forearm muscle origins on humerus: Supinator, Medial Tricep, Lateral Tricep, Pronator, Brachialis. By the end of this section, you will be able to: Identify the following muscles and give their origins, insertions, actions and innervations: The skeletal muscles are divided into axial (muscles of the trunk and head) and appendicular (muscles of the arms and legs) categories. It arises from the nuchal ligament and spinous processes of C7 to T1. The Cellular Level of Organization, Chapter 4. Remaining 0 Correct 0 Wrong 0 Press play! Extensor digitorum muscle:This muscle lies in the extensor compartment and arises from the lateral epicondyle. Simplify your retention of the thenar muscles by learning the following mnemonic! origin: neck It also acts as an extensor of the wrist and radial deviator. In addition, you might want to watch our anatomy and physiology lectures on YouTube, or check our anatomy and physiology notes. The semispinalis muscles include the semispinalis capitis, the semispinalis cervicis, and the semispinalis thoracis. It functions as a stabilizer of the scapula, acts as a protractor when reaching forward or pushing, and aids in rotation of scapula. Insertion: Medial proximal condyle of tibia Action: Extends thigh, flexes leg, Origin: Lateral condyle and proximal tibia Insertion: First metatarsal and first cuneiform Action: Dorsiflexes and inverts foot, Origin: Condyles of femur Insertion: Calcaneus by calcaneal tendon Action: Flexes leg, plantar flexes foot, Origin:Posterior, proximal tibia and fibula Insertion: Calcaneus by calcaneal tendon Action: Plantar flexes foot, Origin: Head and shaft of fibula, lateral condyle of tibia Insertion: First metatarsal, first cuneiform Action: Plantar flexes and everts foot, Origin: Lateral COndyle of tibia, shaft of fibula Insertion: Middle of distal phalanges of second through fifth digits Action: Extends toes, dorsiflexes foot, Origin: Inferior border of a rib Insertion: Superior border of rib below Action: Elevates ribs (increases volume in thorax), Origin: Inferior border of a rib Insertion: Superior border of rib below Action: Depresses ribs (decreases volume in thorax), Origin: Posterior occipital bone, ligamentum nuchae, C7-T12 Insertion: Clavicle, Acromion process, and spine of scapula Action: Extends and abducts head, rotates and adducts scapula, fixes scapula, Origin: Spines of T2-5 Insertion: Lower one-third of vertebral border of scapula Action: retraction of scapula, Origin: Ligamentum nuchae, Spines C7-T1 Insertion: Vertebral border of scapula at scapular spine Action: retraction of scapula, Origin: Galea aponeurotica Insertion: Skin superior to orbit Action: Raises eyebrows, draws scalp anteriorly, Origin: Fascia of facial muscles near mouth Insertion: Skin of lips Action: Closes lips, Origin: Frontal and maxilla on medial margin of orbit Insertion: Skin of eyelid Action: Closes eyelid, Origin: Zygomatic arch Insertion: Angle and ramus of mandible Action: Closes mandible, Origin: Temporal fossa Insertion: coronoid process and ramus of mandible Action: Closes mandible, Origin: Sternum, clavicle Insertion: Mastoid process of temporal Action: Abducts, rotates, and flexes head, Origin: Ribs 1-8 Insertion: Vertebral border and inferior angle of scapula Action: Abducts scapula (moves scapula away from spinal column), Origin: Bottom of rib cage, Crest of pubis, symphysis pubis Insertion: xiphoid process, Origin: Ribs 5-12 Insertion: Linea alba, iliac crest, pubis Action: Compresses abdominal wall, laterally rotates trunk, Origin: Inguinal ligament, iliac crest Insertion: Linea alba, ribs 10-12 Action: Compresses abdominal wall, laterally rotates trunk, Origin: the inner surface of the 7th to 12th costal cartilages, the thoracolumbar fascia, the iliac crest horizontally, and the inguinal ligament Insertion: linea alba Action: support for the abdominal wall, directly on top of the sciatic nerve The two bellies are connected by a broad tendon called the epicranial aponeurosis, or galea aponeurosis (galea = apple). It helped me pass my exam and the test questions are very similar to the practice quizzes on Study.com. It is innervated by the posterior scapular nerve. This muscle song will help you learn the major muscles of the human body. This compartment is posterior in anatomical position. Manifestations are limited movement of the shoulder and severe pain. It acts as a lateral rotator and a weak adductor of the shoulder. The longissimus group includes the longissimus capitis, the longissimus cervicis, and the longissimus thoracis. The brevis muscle arises from the lateral epicondyle and inserts onto the dorsal base of the 3rd metacarpal. laterally rotates the femur with hip extension, flexes humerus, antagonist of supraspinatus Long head originates from the Supraglenoid cavity. The Cardiovascular System: The Heart, Chapter 20. The muscle forms the posterior axillary fold and rotates in order to insert onto the floor of the intertubercular sulcus of the humerus. It is caused by proximal interphalangeal joint flexion, and distal interphalangeal joint extension. Finally, the scalenes include the anterior scalene, middle scalene, and posterior scalene. The action of the muscle describes what happens when the more mobile bone is brought toward the more stable bone during a muscular contraction. Flashcard Maker: sean bennet. Like the trapezius, this muscle can be divided into three sets of fibers: anterior, lateral, and posterior. The muscle acts primarily as a supinator of the forearm, as well as a flexor of the elbow. This muscle also prevents the humeral head from moving too far upwards while the deltoidis in action, as do all the rotator cuff muscles. The humeroulnar head arises from the medial epicondyle and the radial head arises from the superior anterior surface of the radial shaft. The tendon is kept close to the bones by a series of flexor tendon sheaths, which lubricate the tendon and prevent bowstringing (excessive loss of proximal pulley). The tendon of the muscle passes in its own tunnel to enter the palm and it inserts onto the base of the 1st distal phalanx. Its innervation is from the upper suprascapular nerve. The patient will present with tenderness within the anatomical snuffbox. It is caused by damage to the extensor tendon complex as it inserts onto the distal phalanx of any of the digits. You will feel the movement originate there. We strive for 100% accuracy, but nursing procedures and state laws are constantly changing. Naming Skeletal Muscles | How are Muscles Named? The muscles of the anterior neck assist in deglutition (swallowing) and speech by controlling the positions of the larynx (voice box), and the hyoid bone, a horseshoe-shaped bone that functions as a foundation on which the tongue can move. The extrinsic muscles move the whole tongue in different directions, whereas the intrinsic muscles allow the tongue to change its shape (such as, curling the tongue in a loop or flattening it). It arises from the occipital bones, occipital protuberance and nuchal lines, as well as the spinous processes of C7 through T12. Muscles always pull. 2. The brachialis originates on the humerus, and it inserts on the front of the ulna. The scalene muscles include the anterior scalene muscle (anterior to the middle scalene), the middle scalene muscle (the longest, intermediate between the anterior and posterior scalenes), and the posterior scalene muscle (the smallest, posterior to the middle scalene). The hand (manual region) is the terminal end and focus of the upper limb. It is often grouped as one of the muscles of the arm due to its insertion, but its actions involve the shoulder portion only, this why it has been included in the shoulder section here. Phew. It blends into the thoracolumbar fascia, which acts to stabilize the sacroiliac joints along with the gluteus maximus muscles. Skeletal Muscles (Comments, Origin, Insertion, Action, Nerve) by melissa1780d, Mar. Biceps femoris, semitendinosus, and semimembranosus. The extrinsic muscles of the hand originate outside the hand, commonly the forearm, and insert into hand structures. My insertion is transverse processes C1-C4, mastoid process, and occipital bone. In this article we will discuss the gross (structure) and functional anatomy (movement) of the muscles of the upper limb. All rights reserved. Action: Extends thigh, flexes leg, Narrower than semimembranosus the iliopsoas or inner hip muscles: Psoas major. Some axial muscles cross over to the appendicular skeleton. Here's a mnemonic that summarizes the brachioradialis and helps you to remember it. (Superior part: Anterior surface of superior angle. inserion: medial border of scapula It arises from the lateral epicondylar ridge and inserts onto the radial styloid process. The latissimus dorsi is a large back muscle responsible for the bulk of adduction of the arm (pulling the arm to the sides of . insertion: top of scapula The radial two lumbricals are innervated by the median nerve and the ulnar two are innervated by the ulnar nerve. As a result it acts as a flexor, extensor, and abductor of the shoulder. origin: along spinus process of vertebrae and occipital bone The buccinator muscle compresses the cheek. Bony Landmarks Types & Identification | What are Femur Landmarks? Because of its mobility, the tongue facilitates complex speech patterns and sounds. It is innervated by the median nerve a branch of the lateral and medial cord of the brachial plexus. The insertions of these muscles have fibers intertwined with connective tissue and the dermis of the skin. Do you struggle with straight memorization? It causes flexion of the interphalangeal joint (IP joint) of the thumb, as well as flexion at the metacarpophalangeal joint (MP joint). An easy way to remember this little fact is to keep in mind the following mnemonic. The first describes action in terms of the bone to which the muscle is attached or the appendage that is moved. It is a powerful superficial muscle of the shoulder. The triceps brachii becomes the agonist - while the biceps brachii is the antagonist - when we extend our forearm. action: elevates scapula, The posterior hamstring muscle group - The genioglossus depresses the tongue and moves it anteriorly; the styloglossus lifts the tongue and retracts it; the palatoglossus elevates the back of the tongue; and the hyoglossus depresses and flattens it. Flexor pollicis longus muscle:This muscle is found superficially within the deep layer. The segmental muscles include the interspinales and intertransversarii. Weve created muscle anatomy charts for every muscle containing region of the body: Each chart groups the muscles of that region into its component groups, making your revision a million times easier. Themedial pterygoid and lateral pterygoid muscles provide assistance in chewing and moving food within the mouth by moving the mandible laterally and medially to grind food between the molars. See at a glance which muscle is innervated by which nerve. It is innervated by the musculocutaneous nerve. This system reflects the bones of the skeleton system, which are also arranged in this manner. The transversospinales muscles run from the transverse processes to the spinous processes of the vertebrae. Some People Bang Like Monkeys. It inserts on the distal phalangesof the 2nd to 5th digits and acts to flex the distal IP joints of the fingers. Extensor carpi radialis longus and brevis muscles:The longus muscle arises from the lateral epicondylar ridge and inserts onto the dorsal surface of the 2nd metacarpal. There's a lot to learn about the anatomy of the upper limb muscles. Insertion: Crest of lesser tubercle of humerus Action: Extends, adducts, and medially rotates arm (spirals underarm to front . Insertion: mastoid process of temporal bone, occipital bone. Its supinating effect are maximal when the elbow is flexed. What are you waiting for? It also has a role in stabilizing the humerus and part of the rotator cuff of four muscles. Origin: Bsc Functional Anatomy and Biomechanics. Insertion: Proximal, medial tibia (inferior to medial condyle) Brachialis muscle:This is the deep primary flexor of the elbow and arises from the lower part of the anterior surface of the humerus. Kinesiological Analysis: Description & Major Components, Massage Therapy Scope of Practice | Overview, Purpose & Manipulation. It inserts into the lateral surfaces of the middle phalanges of the 2nd to 5th digits. From the sides and the back of the neck, the splenius capitis inserts onto the head region, and the splenius cervicis extends onto the cervical region. Let's take a look at forearm flexion and identify the roles of the different muscles involved. Muscles of the Upper Limb Pectoralis minor ORIGIN: anterior surface of ribs 3 - 5 ACTION INSERTION: coracoid process (scapula) Muscles Stabilizing Pectoral Girdle INNERVATION: pectoral nerves: protracts / depresses scapula (Anterior view) Serratus anterior ORIGIN: ribs 1 - 8 INSERTION: ACTION medial border of scapula stabilizes / depresses You ride Longer on a Superhighway. If the place is on the bone that moves during the action, the attachment is called an insertion. Plus, get practice tests, quizzes, and personalized coaching to help you The good news? An agonist, or as I said before, a prime mover, is the muscle that is primarily responsible for the movement described: forearm flexion. Author: The muscle causes flexion of the wrist and ulnar deviation when its acts with extensor carpi ulnaris. It consists mainly of type 1 muscle fibers and hence provides sustained elbow extension. The muscle also forms the medial border of the cubital fossa. Interossei:These are grouped into four dorsal and threepalmar interossei and are part of the midpalmar group. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. You'll find this conveniently illustrated on the cheat sheets. It acts to draw the scapula lateral, forward, downward, and stabilizes the scapula. As the muscles contract, they exert force on the bones, which help to support and move our body along with its appendages. : imagine holding a suitcase or briefcase at your side. Supraspinatus muscle: This rotator cuff muscle is deep and originates from the supraspinous fossa which is located on the posterior superior portion of the scapula. Injection Gone Wrong: Can You Spot The Mistakes? Axial muscles originate on the axial skeleton (the bones in the head, neck, and core of the body), whereas appendicular muscles originate on the bones that make up the bodys limbs. Tap the Skeletal System Icon, and press the Plus button until you come to the Origin and Insertion layer (the fourth layers of the system). Subscapularis muscle:This is another muscle of the rotator cuff, which is deep and arises from the large anterior subscapular fossa. #shorts #anatomy. The medial head is supplied by the ulnar nerve, and the lateral head by the anterior interosseous branch. For example, the brachialis is a synergist of the biceps brachii during forearm flexion. The hand serves as the origin and/or insertion for a vast number of muscles. Read more. The muscle has a frontal belly and an occipital belly (near the occipital bone on the posterior part of the skull). Enter your email address below and hit "Submit" to receive free email updates and nursing tips. Join the nursing revolution. When the whole muscle acts as a unit it acts as a medial rotator and adductor the arm at the shoulder. It divides and allows the tendon of flexor digitorum profundus to pass through at Campers chiasm (tendon split). The sternocleidomastoid divides the neck into anterior and posterior triangles. It acts to extend the pinky as well as the wrist. This muscle divides the neck into anterior and posterior triangles when viewed from the side (Figure 11.4.8). Franchesca Druggan BA, MSc When a movement is repeated over time, the brain creates a long-term muscle memory for that task, eventually allowing it to be performed with little to no conscious . As these attachments of the brachialis are similar in nature to those of the biceps brachii, so is its action. The genioglossus (genio = chin) originates on the mandible and allows the tongue to move downward and forward. The hand is truly the epitome of anatomical complexity. Agonists, or prime movers, are responsible for the bulk of the action. The muscles discussed below are essential to everyday life and advanced movements such as writing. Why are the muscles of the face different from typical skeletal muscle? The Lymphatic and Immune System, Chapter 26. insertion: spinus process of scapula As the supraspinatus passes under the subacromial arch it is vulnerable to rupture from a bony spur. This is a fracture of the proximal third of the ulna with associated dislocation of the proximal radioulnar joint. As a member, you'll also get unlimited access to over 88,000 Most skeletal muscles create movement by actions on the skeleton. Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. Most anatomy courses will require that you at least know the name and location of the major muscles, though some anatomy courses will also require you to know the function (or action), the insertion and origin, and so on. It is innervated by spinal nerves C3-C4 and C5 via the posterior (dorsal) scapular nerve. Posterior dislocation can occur in epileptics or electric shocks. The biceps brachii originates on the front of the scapula of the shoulder and inserts on the front of the radius in the forearm. It consists mainly of type 2a fibers and provides power and endurance to elbow extension. Resulting in the inability to straighten the digit. Do Humans Have an Open or Closed Circulatory System? Let's take a look at an example. The second way to describe a muscle's action is based on the joint, or the articulation. These muscles are located inside the eye socket and cannot be seen on any part of the visible eyeball (Figure 11.4.3 and Table 11.3). The longus is innervated by the radial nerve and the brevis by the posterior interosseous branch. Origin: from the ischium of the pelvis Insertion: the tibia of the lower leg. Generally the muscles in the same compartment insert into the same bone. Click the card to flip . The muscles in the face create facial expression by inserting into the skin rather than onto bone. The short head arises from the coracoid process and both heads unite. The strap-like infrahyoid muscles generally depress the hyoid bone and control the position of the larynx. The forearm is the region between the elbow and thewrist and is composed of an extensor and flexor compartment. Origin: Inferior angle of scapula. The long head arises from the infraglenoid tubercle and consists of mainly type 2b fibers. The occipitofrontalis muscle elevates the scalp and eyebrows. Thats why wecreated muscle anatomy charts; your condensed, no-nonsense, easy to understand learning solution. There are several small facial muscles, one of which is the corrugator supercilii, which is the prime mover of the eyebrows. Each of these muscles has a name; for example, again, the biceps brachii and now the triceps brachii, responsible for both forearm flexion and forearm extension, respectively. Commonly referred to as impingement syndrome. It acts as an adductor (to add to the body), assists in extension and medial rotation, as well as stabilization of the scapula. Biceps brachii muscle:This superficial muscle forms the bulk of the anterior compartment of the arm. 2009. The actions and innervation are the same as the rhomboid major. Muscles of Face ----- skull----- skin of face----- facial expression Orbicularis oculi frontal and maxilla & tissue of eyelid closes eye ligaments around orbit Kenhub. Extrinsic tongue muscles insert into the tongue from outside origins, and the intrinsic tongue muscles insert into the tongue from origins within it. It can be difficult to learn the names and locations of the major muscles. For . Action: Adducts thigh, Origin: iliac crest, anterior iliac surface Insertion: iliotibial band of fasciae latae Action: Flexes, abducts, and medially rotates thigh, Origin: Outer iliac blade, iliac crest, sacrum, coccyx Insertion: Gluteal tuberosity of femur, iliotibial band of fasciae latae Action: Extends and laterally rotates thigh, braces knee, Origin: Outer iliac blade Insertion: Greater trochanter of femur Action: Abducts and medially rotates thigh, Origin: Pubis, ischium Insertion: Gluteal tuberosity, linea aspera, adductor tubercle of distal femur Action: Adducts, flexes, extends and laterally rotates thigh, Origin: Anterior superior iliac spine Insertion: Proximal, medial tibia Action: Flexes and laterally rotates thigh, flexes leg, Origin: Anterior inferior iliac spine, margin of acetabulum Insertion: Tibial tuberosity by patellar tendon Action: Flexes thigh, extends leg, Origin: Greater trochanter of femur, linea aspera of femur Insertion: Tibial tuberosity by patellar tendon Action: Extends Leg, Origin: Linea aspera, medial side Insertion: Tibial tuberosity by patellar tendon Action: Extends Leg, Origin: Proximal, anterior femur Insertion: Tibial tuberosity by patellar tendon Action: Extends Leg, Origin: (long head) Ischial tuberosity, (short head) linea aspera The opponens digiti minimi arises from the hook of hamate and flexor retinaculum. Register now It has both sternocostal and clavicular heads. Due to these attachments, contraction and muscle shortening of the biceps flexes the forearm. I nfraspinatus muscle : This muscle is located in the large posterior infraspinous fossa located inferior to the scapular spine. They work on the hyoid bone, with the suprahyoid muscles pulling up and the infrahyoid muscles pulling down. In our cheat sheets, you'll find the origin (s) and insertion (s) of every muscle. Rhomboid major muscle:This is a ribbon like rhomboid shaped muscle that arises from the spinous processes of the T2-T5 (T = thoracic) vertebraeand inserts onto the medial border of the scapula. It is innervated by the medial (C8-T1) and lateral (C5-C7) pectoral nerves. The muscles are named after their functions, with the flexor muscle lateral most, the abductor medial most, and the opponens muscle lying deep. Pick a muscle and look up its origin, insertion, and action. When movement of a body part occurs, muscles work in groups rather than individually. The Cardiovascular System: Blood, Chapter 19. Registered Nurse, Free Care Plans, Free NCLEX Review, Nurse Salary, and much more. flashcard sets. Some of the axial muscles may seem to blur the boundaries because they cross over to the appendicular skeleton. Dimitrios Mytilinaios MD, PhD In our cheat sheets, youll find the origin(s) and insertion(s) of every muscle. The serratus anterior muscle originates from the 1st to 8th or 9th rib s and inserts at the anterior surface of the scapula. Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. For example, upper limb muscles are grouped by shoulder and arm, forearm and hand. Flex and extend the muscle and feel its movements at the origin, midpoint, and insertion. We will use examples to describe how the origin and insertion affect the action of a skeletal muscle. The geniohyoid depresses the mandible in addition to raising and pulling the hyoid bone anteriorly. Conventionally, a muscle origin describes the attachment of a muscle on the more stable bone. It pronates the radius and is innervated by the anterior interosseous branch of the median nerve. These muscles bring together the spinous and transverse processes of each consecutive vertebra. It is also capable of weakly supinating and pronating the forearm. The muscle acts to supinate the forearm and forms the lateral border of the cubital fossa. Place your finger on your eyebrows at the point of the bridge of the nose. Use the following mnemonic to remember the origins of the biceps brachii muscle. Molly Smith DipCNM, mBANT An error occurred trying to load this video. They'll teach you everything you need to know about attachments, innervations and functions. Stretching the muscle causes the triceps muscle to contract and, thus, slow flexion. During that particular movement, individual muscles will play different roles depending on their origin and insertion. origin: cervical vertebrae We will study these muscles in depth. Those in the same compartment will have the same action. It causes extension of the IP joints, the MP joints, and wrist. copyright 2003-2023 Study.com. Click the card to flip . Muscles of the shoulder and upper limb can be divided into four groups: muscles that stabilize and position the pectoral girdle, muscles that move the arm, muscles that move the forearm, and muscles that move the wrists, hands, and fingers. Get your muscle charts below. We will also discuss the clinical relevance of the upper limb. It arises from the flexor retinaculum, scaphoid tubercle, and trapezium. If the place is a bone that remains immobile for an action, the attachment is called an origin. Mnemonics to recall the muscles of the rotator cuff are:. Place your fingers on both sides of the neck and turn your head to the left and to the right. F lexor digitorum profundus muscle:It rises from the anterior proximal surface of the ulna and adjacent interosseous membrane and deep fascia of the forearm. Extensor indicis proprius muscle:This muscle arises from the posterior distal 3rd of the ulna and interosseous membrane and inserts onto the middle and distal phalanx of the index finger. There are numerous muscles in this compartment as well. I would definitely recommend Study.com to my colleagues. The omohyoid muscle, which has superior and inferior bellies, depresses the hyoid bone in conjunction with the sternohyoid and thyrohyoid muscles. Therefore, when they contract, the origin pulls the insertion and connected bone closer . Avascular necrosis of the proximal segment is a common complication. Muscles of the Posterior Neck and the Back. It is innervated by the C3 & C4 and the accessory nerve (cranial nerve 11 = CN11). posterior muscles - gluteus maximus muscle (the largest muscle in the body) and the hamstrings group, which consists of the biceps femoris, semimembranosus, and semitendinosus muscles. Facial muscles are different in that they create facial movements and expressions by pulling on the skinno bone movements are involved. Test your knowledge on the muscles of the arm right away using our handy round-up of quizzes, diagrams and free worksheets. Origin: Ischial tuberosity The damaged nerve causes a weakened serratus anterior, leading to the scapula not being pulled down and in during circumduction. There are numerous muscles in this compartment. See our full, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on WhatsApp (Opens in new window), Click to share on Pocket (Opens in new window), Click to share on Telegram (Opens in new window), Click to share on Skype (Opens in new window), IV Drug Use Complications & Dangers: (Endocarditis, Infection, Infectious Diseases). The muscle inserts onto the anterior lateral surface of the body of the radius. Shahab Shahid MBBS 190 lessons Gross Anatomy I. It inserts onto the spine of the scapula, acromion, and lateral third of the clavicle. It acts to extend the wrist and also contributes to radial deviation of the wrist. Copyright It is the chief medial rotator of the shoulder and modulates the movement of the deltoid. psoas major - origin : lumbar vertebrae The origin is the fixed attachment, while the insertion moves with contraction. Groups of muscles are involved in most movements and names are used to describe the role of each muscle involved. Action: Actions Alone(unilateral), lateral flexion of vertebral column; Together (bilateral), depression of thoracic rib cage, any of the three pairs of muscles on each side of the neck that are involved in moving the neck, and in breathing

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