Upper Extremity (Muscle Facts)

tip of coracoid process

tip of coracoid process

what is the origin of the short head in the biceps brachii m?

supraglenoid tubercle

what is the origin of the long head in the biceps brachii m?

radial tuberosity and fascia of forearm via bicipital aponeurosis

what is the insertion of the biceps brachii m?

musculocutaneous n

what is the innervation of the biceps brachii m?

supinates forearm, flexes elbow joint when supinated, flexes shoulder joint, short head resists dislocation of shoulder

what is the action of the biceps brachii m?

brachial a,v, basilic v, cephalic v

what is the blood supply of the biceps brachii m?

distal anterior surface of humerus

what is the origin of the brachialis m?

coronoid process and ulnar tuberosity

what is the insertion of the brachialis m?

musculocutaneous n

what is the innervation of the brachialis m?

flexes elbow joint

what is the action of the brachialis m?

brachial a,v, basilic v, cephalic v

what is the blood supply of the brachialis m?

tip of coracoid process

what is the origin of the coracobrachialis m?

medial surface of humerus

what is the insertion of the coracobrachialis m?

musculocutaneous n

what is the innervation of the coracobrachialis m?

flexes and adducts shoulder joint, resists dislocation of shoulder

what is the action of the coracobrachialis m?

brachial a,v, basilic v, cephalic v

what is the blood supply of the coracobrachialis m?

infraglenoid tubercle

what is the origin of the long head in the triceps brachii m?

posterior surface of humerus, superior to radial groove

what is the origin of the lateral head in the triceps brachii m?

posterior surface of humerus, inferior to radial groove

what is the origin of the medial head in the triceps brachii m?

proximal olecranon and forearm fascia

what is the insertion of the triceps brachii m?

radial n

what is the innervation of the triceps brachii m?

extends elbow, long head extends shoulder joint and resists dislocation of humerus

what is the action of the triceps brachii m?

profunda brachii a,v

what is the blood supply of the triceps brachii m?

lateral epicondyle of humerus

what is the origin of the anconeus m?

lateral surface of olecranon and superior part of posterior ulna

what is the insertion of the anconeus m?

radial n

what is the innervation of the anconeus m?

assists in elbow extension, stabilizes elbow joint, abducts ulna during pronation

what is the action of the anconeus m?

profunda brachii a,v

what is the blood supply of the anconeus m?

coronoid process of ulna

what is the origin of the ulnar head in the pronator teres m?

medial epicondyle of humerus

what is the origin of the humeral head in the pronator teres m?

middle of convexity of lateral surface of radius

what is the insertion of the pronator teres m?

median n

what is the innervation of the pronator teres m?

pronates and flexes forearm

what is the action of the pronator teres m?

ulnar a,v, radial a,v

what is the blood supply of the pronator teres m?

medial epicondyle of humerus

what is the origin of the flexor carpi radialis m?

base of 2nd (3rd) metacarpal

what is the insertion of the flexor carpi radialis m?

median n

what is the innervation of the flexor carpi radialis m?

flexes and abducts wrist

what is the action of the flexor carpi radialis m?

ulnar a,v, radial a,v

what is the blood supply of the flexor carpi radialis m?

medial epicondyle of humerus

what is the origin of the palmaris longus m?

distal flexor retinaculum, palmar aponeurosis

what is the insertion of the palmaris longus m?

median n

what is the innervation of the palmaris longus m?

flexes wrist and tenses palmar aponeurosis

what is the action of the palmaris longus m?

ulnar a,v, radial a,v

what is the blood supply of the palmaris longus m?

medial epicondyle of humerus

what is the origin of the humeral head in the flexor carpi ulnaris m?

olecranon and posterior border of ulna (via aponeurosis)

what is the origin of the ulnar head in the flexor carpi ulnaris m?

pisiform, hook of hamate, 5th metacarpal

what is the insertion of the flexor carpi ulnaris m?

ulnar n

what is the innervation of the flexor carpi ulnaris m?

flexes and adducts wrist

what is the action of the flexor carpi ulnaris m?

ulnar a,v, radial a,v

what is the blood supply of the flexor carpi ulnaris m?

medial epicondyle of humerus, coronoid process of ulna

what is the origin of the humero-ulnar head in the flexor digitorum superficialis m?

oblique lines of radius

what is the origin of the radial head in the flexor digitorum superficialis m?

shafts (bodies) of middle phalanges of medial four digits

what is the insertion of the flexor digitorum superficialis m?

median n

what is the innervation of the flexor digitorum superficialis m?

flexes wrist joint, flexes proximal interphalangeal joints of medial four fingers, flexes proximal phalanges at metacarpophalangeal joints

what is the action of the flexor digitorum superficialis m?

ulnar a,v, radial a,v

what is the blood supply of the flexor digitorum superficialis m?

proximal, medial, and anterior surfaces of ulna and interosseous membrane

what is the origin of the flexor digitorum profundus m?

base of distal phalanges of medial four digits

what is the insertion of the flexor digitorum profundus m?

median n (anterior interosseous branch)

what is the innervation of the lateral part (to digits 2 and 3) in the flexor digitorum profundus m?

ulnar n

what is the innervation of the medial part (to digits 4 and 5) in the flexor digitorum profundus m?

flexes wrist joint, flexes distal interphalangeal joints of medial four fingers, assists with wrist flexion

what is the action of the flexor digitorum profundus m?

ulnar a,v, radial a,v

what is the blood supply of the flexor digitorum profundus m?

anterior radius and adjacent interosseous membrane

what is the origin of the flexor pollicis longus m?

base of distal phalanx of thumb

what is the insertion of the flexor pollicis longus m?

anterior interosseous n, from median n

what is the innervation of the flexor pollicis longus m?

flexes wrist, flexes metacarpophalangeal and interphalangeal joints of thumb

what is the action of the flexor pollicis longus m?

ulnar a,v, radial a,v

what is the blood supply of the flexor pollicis longus m?

distal and anterior surface of ulna

what is the origin of the pronator quadratus m?

distal and anterior surfaces of radius

what is the insertion of the pronator quadratus m?

anterior interosseous n, from median n

what is the innervation of the pronator quadratus m?

pronates forearm, deep fibers bind radius and ulna together

what is the action of the pronator quadratus m?

ulnar a,v, radial a,v

what is the blood supply of the pronator quadratus m?

proximal part of lateral supraepicondylar ridge of humerus

what is the origin of the brachioradialis m?

lateral surface of distal radius proximal to styloid process

what is the insertion of the brachioradialis m?

radial n

what is the innervation of the brachioradialis m?

weak elbow flexion, maximal when forearm is in midpronated position

what is the action of the brachioradialis m?

brachial a,v

what is the blood supply of the brachioradialis m?

lateral supraepicondylar ridge of humerus

what is the origin of the extensor carpi radialis longus m?

dorsal aspect of base of 2nd metacarpal

what is the insertion of the extensor carpi radialis longus m?

radial n

what is the innervation of the extensor carpi radialis longus m?

extends and abducts wrist joint

what is the action of the extensor carpi radialis longus m?

brachial a,v

what is the blood supply of the extensor carpi radialis longus m?

lateral epicondyle of humerus

what is the origin of the extensor carpi radialis brevis m?

dorsal aspect of base of 3rd metacarpal

what is the insertion of the extensor carpi radialis brevis m?

deep branch of radial n

what is the innervation of the extensor carpi radialis brevis m?

extends and abducts wrist joint, active during fist clenching

what is the action of the extensor carpi radialis brevis m?

anterior interosseous a,v, posterior interosseous a,v

what is the blood supply of the extensor carpi radialis brevis m?

lateral epicondyle of humerus

what is the origin of the extensor digitorum m?

extensor expansions of medial four fingers

what is the insertion of the extensor digitorum m?

posterior interosseous n, continuation of deep branch of radial n

what is the innervation of the extensor digitorum m?

extends wrist joint, extends medial four fingers at metacarpophalangeal joints and interphalangeal joints

what is the action of the extensor digitorum m?

anterior interosseous a,v, posterior interosseous a,v

what is the blood supply of the extensor digitorum m?

lateral epicondyle of humerus

what is the origin of the extensor digiti minimi m?

extensor expansions of 5th finger

what is the insertion of the extensor digiti minimi m?

posterior interosseous n, continuation of deep branch of radial n

what is the innervation of the extensor digiti minimi m?

extends wrist joint, extends 5th finger at metacarpophalangeal joints and interphalangeal joints

what is the action of the extensor digiti minimi m?

anterior interosseous a,v, posterior interosseous a,v

what is the blood supply of the extensor digiti minimi m?

lateral epicondyle of humerus, posterior border of ulna via a shared aponeurosis

what is the origin of the extensor carpi ulnaris m?

dorsal aspect of base of 5th metacarpal

what is the insertion of the extensor carpi ulnaris m?

posterior interosseous n, continuation of deep branch of radial n

what is the innervation of the extensor carpi ulnaris m?