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Biceps brachii INSERTION

Radial or bicipital tuberosity via a thick tendon; a portion of the tendon splits off medially and forms a broad sheet called the bicipital aponeurosis - fuses with deeper fascia of the forearm

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Biceps brachii ORIGIN

Long head: supraglenoid tubercle of the scapula (tendon passes through the synovial cavity of the shoulder joint, the thru an osseofibrous tunnel in the intertubercular groove)
Short head: coracoid process of scapula

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Biceps brachii ACTION

strong supinator of forearm when flexed, flexor of elbow joint-- especially when supinated; weak flexor of glenohumeral joint

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Biceps Brachii INNERVATION

musculocutaneous n.

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Coracobrachialis m. ORIGIN

Coracoid process

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Coracobrachialis m. INSERTION

medial shaft of humerus

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Coracobrachialis m. ACTION

Flexion and adduction of glenohumeral joint

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Coracobrachialis m. INNERVATION

Musculocutaneous n.

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Brachialis m. ORIGIN

Anterior humerus

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Brachialis m. INSERTION

Ulnar tuberosity and coronoid process of ulna

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Brachialis m. ACTION

Most powerful flexor of elbow

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Brachialis m. INNERVATION

Musculocutaneous n.

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Triceps brachii m. ORIGIN

Long head: Infraglenoid tubercle of scapula
Lateral head: Posterior humerus; superior to radial groove
Medial head: Posterior humerus; inferior to radial groove

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Triceps brachii m. INSERTION

Olecranon process of the ulna

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Triceps brachii m. ACTION

Extends elbow joint

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Triceps brachii m. INNERVATION

Radial n.

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Pronator teres m. ORIGIN

Medial epicondyle of humerus; coronoid process of ulna

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Pronator teres m. INSERTION

Lateral side of shaft of radius; halfway up length

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Pronator teres m. ACTION

Pronates forearm, assists in flexing elbow

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Pronator teres m. INNERVATION

Median n.

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Flexor carpi radialis m. ORIGIN

Medial epicondoyle of humerus

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Flexor carpi radialis m. INSERTION

Base of second metacarpal

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Flexor carpi radialis m. ACTION

Flexes wrist; assists in flexing elbow, abducts wrist

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Flexor carpi radialis m. INNERVATION

Median n.

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Palmaris longus m. ORIGIN

Medial epicondyle of humerus

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Palmaris longus m. INSERTION

Flexor retinaculum at wrist; palmar aponeurosis

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Palmaris longus m. ACTION

Flexes wrist; assists in flexing elbow

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Palmaris longus m. INNERVATION

Median n.

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Flexor carpi ulnaris m. ORIGIN

Medial epicondyle humerus; posterior border of ulna

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Flexor carpi ulnaris m. INSERTION

Pisiform bone and via ligaments to base of fifth metacarpal and to hook of Hamate

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Flexor carpi ulnaris m. ACTION

Flexes wrist and assists in flexing elbow; adducting wrist

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Flexor carpi ulnaris m. INNERVATION

Ulnar n.

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Flexor digitorum superficialis m. ORIGIN

Medial epicondyle humerus; ulna and radius

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Flexor digitorum superficialis m. INSERTION

Middle phalanges of digits II, III, IV, and V

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Flexor digitorum superficialis m. ACTION

Flexes MP and PIP joints, assists in flexing elbow and wrist

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Flexor digitorum superficialis m. INNERVATION

Median n.

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Flexor pollicis longus m. ORIGIN

Anterior side of radius and interosseous membrane

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Flexor pollicis longus m. INSERTION

Distal phalanx of thumb (pollex)

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Flexor pollicis longus m. ACTION

Flexes MP and IP joints of thumb, assists in flexing wrist

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Flexor pollicis longus m. INNERVATION

Median n.

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Flexor digitorum profundus m. ORIGIN

Anterior side of shaft of ulna, and interosseous membrane

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Flexor digitorum profundus m. INSERTION

Distal phalanges of digits II, III, IV, and V

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Flexor digitorum profundus m. ACTION

Flexes MP, PIP, and DIP joints; assists in flexing wrist

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Flexor digitorum profundus m. INNERVATION

Median n. to digits II and III,
Ulnar n. to digits IV, and V

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Pronator quadratus m. ORIGIN

Anterior side of ulna, distally

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Pronator quadratus m. INSERTION

Anterior side a radius, distally

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Pronator quadratus m. ACTION

Pronates forearm

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Pronator quadratus m. INNERVATION

Median n.

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Brachial Fascia

Investing deep fascia of the arm,
Extensions of brachial fascia (medial and lateral intermuscular septa) attach to the humerus and divide the arm into anterior and posterior compartments

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Antebrachial fascia

Investing, deep fascia of the forearm
With the interosseous membrane, divides forearm into anterior and posterior compartments

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Flexor retinaculum

Thickening of the antebrachial fascia near the anterior wrist; with underlying bone, forms the carpal tunnel. Tendons of muscles of the anterior forearm as well as the median nerve pass through this compartment.

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Extensor retinaculum

Thickening of antebrachial fascia, near the posterior wrist. Tendons of muscles in the posterior compartment of the forearm pass deep to this retinaculum.

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Osseofibrous tunnel

Carpal tunnel in the upper limb

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Synovial sheath

double layer of synovial membrane in the osseofibrous tunnels that enclose the tendons, deep to the fibrous digital sheaths, and permits the free sliding movement of tendons.

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Musculocutaneous n. Innervation

coracobrachialis, biceps brachii, and brachialis

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Musculocutaneous n. termination

becomes the lateral cutaneous n. of the forearm and supplies skin on lateral side of forearm

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Radial n. innervation

triceps brachii, motor innervation to the posterior component of the forearm (posterior interosseus n.)

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Radial n. termination

Superficial branch - cutaneous innervation of the hand, courses in anterior compartment of the forearm
Deep branch - motor innervation of posterior forearm, becomes posterior interosseus n.

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Median n. path and innervation

courses with brachial artery, and along midline of forearm deep to pronator teres and FDS. Crosses wrist medial to FCR tendon and deep to palmaris longus, enters hand deep to flexor retinaculum (Through the carpal tunnel).
*Innervates nothing in arm, but all of the anterior forearm except FCU and 1/2 FDP

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Median n. termination

gives off anterior interosseus n. which courses with the anterior interosseus a. (branch of the common interosseus a.) and innervates the deep flexor muscles of the forearm.

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Ulnar n. path and innervation

courses down medial humerus with brachial a. and medial n., pierces medial septum of the arm, passes posterior to medial epicondyle (susceptible to injury).
-runs down forearm deep to flexor carpi ulnaris and crosses wrist just lateral to its tendon and pisiform bone. Enter superficial to flexor retinaculum
*innervates nothing in the arm, FCU and half of FDP

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Medial brachial cutaneous n.

branch of medial cord - supplies skin on the medial and anterior side of the arm

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Medial antebrachial cutaneous n.

a branch of the medial cord - supplies skin on the medial and anterior side of the forearm