The shoulder is most unstable in extension and external rotation. 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. The insertion then, is the attachment of a muscle on the more moveable bone. It runs down the posterior compartment of the forearm and inserts into the middle and distal phalanges of the 2nd to 5th digits. John has taught college science courses face-to-face and online since 1994 and has a doctorate in physiology. It is innervated by the posterior interosseous branch. EKG Rhythms | ECG Heart Rhythms Explained - Comprehensive NCLEX Review, Simple Anatomy Quiz Most Nurses Get WRONG! The action, or particular movement of a muscle, can be described relative to the joint or the body part moved. You ride Longer on a Superhighway. The sternocleidomastoid divides the neck into anterior and posterior triangles. The sternocostal head arises from the sternum and the superior 6-7 costal cartilages. Muscles of Face ----- skull----- skin of face----- facial expression Orbicularis oculi frontal and maxilla & tissue of eyelid closes eye ligaments around orbit It inserts onto the crest of greater tubercle of the humerus. It blends into the thoracolumbar fascia, which acts to stabilize the sacroiliac joints along with the gluteus maximus muscles. I would definitely recommend Study.com to my colleagues. The erector spinae group forms the majority of the muscle mass of the back and it is the primary extensor of the vertebral column. The brevis muscle arises from the lateral epicondyle and inserts onto the dorsal base of the 3rd metacarpal. Due to this arrangement the deltoid has a large area of origin: from the acromion, lateral superior portion of the clavicle, and lateral third of the scapular spine. This is where the rotator cuff muscles become inflamed and impinged as they pass through the subacromial space. This muscle divides the neck into anterior and posterior triangles when viewed from the side (Figure 11.4.8). A rule of thumb is that any muscle tendon that crosses a joint will act on that joint. Get instant access to this gallery, plus: Introduction to the musculoskeletal system, Nerves, vessels and lymphatics of the abdomen, Nerves, vessels and lymphatics of the pelvis, Infratemporal region and pterygopalatine fossa, Meninges, ventricular system and subarachnoid space, Extensor carpi radialis longus and brevis, Pectoralis major, Pectoralis minor, Deltoid, Latissimus dorsi, Supinator, Extensor digitorum, Extensor carpi ulnaris, Extensor carpi radialis longus and brevis, Extensor indicis proprius, Extensor digiti minimi, Brachioradialis, Thenar eminence, Hypothenar eminence, Interossei, Lumbricals, Inferior angle and lower part of the lateral border of the scapula, Intertubercular sulcus (medial lip) of the humerus, Adduction and medial rotation of the humerus (arm), Lateral border of the scapula (middle part), Greater tubercle of the humerus (inferior facet), Lateral rotation of the arm, stabilization of the humerus as part of the rotator cuff muscles, Greater tubercle of the humerus (middle facet), Greater tubercle of the humerus (superior facet), Assistance in arm abduction,stabilization of the humerus as part of the rotator cuff muscles, Medial rotation of the arm,stabilization of the humerus as part of the rotator cuff muscles, Transverse process of the atlas and axis, posterior tubercles C3 and C4, Posterior surface of the medial scapular border (from the superior angle to the root of the spine of the scapula), Anterior rami of the nerves C3 and C4, dorsal scapular nerve (branch of the C5), Superior nuchal line, external occipital protruberance, nuchal ligament, spinous processes of C7 to T12 vertebrae, Lateral third of the clavicle, acromion and spine of the scapula, Spinal accessory nerve; C3 and C4 spinal nerves, Elevation, depression, and retraction of the scapula, Medial half of the clavicle (clavicular head); anterior surface of the sternum, 1st to 6th costal cartilages, aponeurosis of, Adduction and medial rotation of the humerus, Anterior surface of the 3rd, 4th, and 5th ribs and the fascia overlying the intercostal spaces, Medial border and superior surface of the coracoid process of the scapula, Protraction of the scapula, pulls the coracoid process anteriorly and inferiorly, accessory muscle in respiratory, Lateral third of the clavicle, acromion, and spine of scapula, Abduction and stabilization of the shoulder joint, Spinous processes of T7-L5 and sacrum, iliac crest, X-XII ribs, Distal half of the anterior side of the humerus and intermuscular septa, Flexion of the forearm at the elbow joint, Flexion of the forearm at the elbow joint, supinator of the forearm, accessory flexor of the arm at the glenohumeral joint, Anterior surface of the ulna (distal quarter), Anterior surface of the radius (distal quarter), Forearm pronationand binding of the radius and ulna, Anterior surface of the radius and interosseous membrane, Proximal parts of the anterior and lateral surfaces of the ulna and interosseous membrane, Bases of the phalanges of the 4th and 5th digits (medial part), bases of the phalanges of the 2nd and 3rd digits (lateral part), Ulnar nerve (medial part), anterior interosseous nerve (lateral part), Flexion of the distal phalanges at the interphalangeal joints of the 4th and 5th digits (medial part) and of the 2nd and 3rd digits (lateral part), Medial epicondyle of the humerus and coronoid process of the ulna (humero-ulnar head) and superior half of anterior border (ulnar head), Shafts of middle phalanges of medial four digits, Flexion of middle phalanges at proximal interphalangeal joints and flexion of the proximal phalanges at the metacarpophalangeal joints of the middle four digits, Medial epicondyle of the humerus (common flexor tendon), Flexor retinaculum and palmar aponeurosis, Medial epicondyle of the humerus (humeral head), coronoid process of the ulna (ulnar head), Lateral epicondyle of the humerus, crest of the ulna, supinator fossa, radial collateral and anular ligaments, Surface of the proximal third of the radial shaft, Posterior surfaces of the middle and distal phalanges (2nd-5th), Posterior interosseus nerve (branch of the radial nerve), Extension of the index, middle, ring and little fingers, Lateral epicondyle of the humerus, posterior border of the ulna, Medial side of the base of the metacarpal V, Posterior side of the distal third of the ulnar shaft; interosseous membrane, Proximal two-thirds of the supra-epicondylar ridge of the humerus, Lateral surface of the distal end of the radius, Forearm flexion, especially during mid-pronation, Flexor retinaculum and tubercle of trapezium and scaphoid bones, Thumb flexion, abduction, and medial rotation resulting in a combined movement called opposition, Abduction of the 5th digit and flexion assistance of the proximal phalanx, Base of the proximal phalanx of the 5th digit, Flexion of the proximal phalanx of the 5th digit, Sides of two adjacent metacarpals (dorsal interossei) and palmar surfaces of the 2nd, 4th, 5th metacarpals (palmar interossei), Bases of the proximal phalanges via the extensor expansions of the 2nd to 4th digits (dorsal interossei) and 2nd, 4th, and 5th digits (palmar interossei), Abduction of the 2nd to 4th digits (dorsal interossei), adduction of the 2nd, 4th, and 5th digits (palmar interossei), assisting the lumbricals in extension, Tendons of the flexor digitorum profundus, Lateral expansions of the 2nd to 5th digits, Flexion of the metacarpophalangeal joints and extension of the interphalangeal joints of the 2nd to 4th digits. PAD DAB ('Use your hand to dab with a pad'). origin: along spinus process of vertebrae and occipital bone Do you find it difficult to memorize the muscles of the hand? The muscle arises mainly from the flexor retinaculum and tubercle of the trapezium and inserts onto the proximal phalanx or metacarpal of the thumb. Try refreshing the page, or contact customer support. It is caused by damage to the extensor tendon complex as it inserts onto the distal phalanx of any of the digits. The muscles of the back and neck that move the vertebral column are complex, overlapping, and can be divided into five groups. It is innervated by the posterior interosseous branch. The extrinsic muscles of the hand originate outside the hand, commonly the forearm, and insert into hand structures. origin: tip of the coracoid process The upper fibers act to extend the neck, elevate, and upwardly rotate. Kinesiological Analysis: Description & Major Components, Massage Therapy Scope of Practice | Overview, Purpose & Manipulation. Get your muscle charts below. It pronates the radius and is innervated by the anterior interosseous branch of the median nerve. Like the trapezius, this muscle can be divided into three sets of fibers: anterior, lateral, and posterior. flashcard sets. These insert into the 2nd - 5th proximal phalanges. Join the nursing revolution. It passes anteriorly and around the thoracic cage as if wrapping. Agonists, or prime movers, are responsible for the bulk of the action. For . The spinalis group includes the spinalis capitis, the spinalis cervicis, and the spinalis thoracis. Origin: Ischial Tuberosity I would honestly say that Kenhub cut my study time in half. Pectoralis major muscle :This is a superficial, large, fan shaped muscle that makes up the bulk of the pectoral (chest) region. The middle fibers retract (adduct). It is innervated by the deep branch of the radial nerve. 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. Get unlimited access to over 88,000 lessons. It inserts onto the radial aspect of the 1st metacarpal. Here's a mnemonic that summarizes the brachioradialis and helps you to remember it. My origin is the inferior skull, spinous processes T1-6. The muscle acts primarily as a supinator of the forearm, as well as a flexor of the elbow. 1. O: opponens pollicis. Forearm muscle origins on humerus: Supinator, Medial Tricep, Lateral Tricep, Pronator, Brachialis. The neurovascular bundle (intercostal nerve, artery and vein) will separate these two muscles. L: lateral two lumbricals. which stands for supraspinatus, infraspinatus, teres minor, and subscapularis. Serratus anterior muscle:This muscle is so named due to its anterior digitations that have a serrated or finger-like appearance. Its action is elevation of the scapula as well as superior rotation of the scapula. For example, the biceps brachii performs flexion of the forearm as the forearm is moved. Why are the muscles of the face different from typical skeletal muscle? They'll teach you everything you need to know about attachments, innervations and functions. 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). 1 / 24. It acts to extend the wrist, fixes writs during clenching fist, and when it acts with flexor carpi ulnaris it contributes to ulnar deviation of the wrist.

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