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Glossary of Anat- Arm Muscles

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biceps brachii short head: origin
tip of coracoid process of scapula
biceps brachii long head: origin
supraglenoid tubercle of scapula
biceps brachii: insertion
tuberosity of radius and fascia of forearm via bicipital aponeurosis
biceps brachii: innervation
musculocutaneous nerve (C5, C6)
biceps brachii: action
supinates forearm and, when it is supine, flexes forearm; shorthead resists dislocation of shoulder
biceps brachii: blood supply
brachial artery, basilic and cephalic vv
brachialis: origin
distal half of anterior surface of humerus
brachialis: insertion
coronoid process and tuberosity of ulna
brachialis: innervation
musculocutaneous nerve (C5, C6)
brachialis: action
flexes forearm in all positions
brachialis: blood supply
brachial artery, basilic and cephalic veins
coracobrachialis: origin
tip of coracoid process of scapula
coracobrachialis: insertion
middle third of medial surface of humerus
coracobrachialis: innervation
musculocutaneous nerve (C5, C6, C7)
coracobrachialis: action
helps flex and adduct arm; resists dislocation of shoulder
coracobrachialis: blood supply
brachial artery, basilic and cephalic veins
triceps brachii long head: origin
infraglenoid tubercle of scapula
triceps brachii lateral head: origin
posterior surface of humerus, superior to radial groove
triceps brachii medial head: origin
posterior surface of humerus, inferior to radial groove
triceps brachii: insertion
proximal end of olecranon of ulna & fascia of forearm
triceps brachii: innervation
radial nerve (C6, C7, C8)
triceps brachii: action
chief extensor of forearm; long head resists dislocation of humerus; especially important during abduction
triceps brachii: blood supply
profunda brachii artery, brachial vein
anconeus: origin
lateral epicondyle of humerus
anconeus: insertion
lateral surface of olecranon and superior part of posterior surface of ulna
anconeus: innervation
radial nerve (C7, C8, T1)
anconeus: action
assists triceps in extending forearm; stabilizes elbow joint; may abduct ulna during pronation
anconeus: blood supply
profuna brachii artery, brachial vein
pronator teres ulnar head: origin
coronoid process
pronator teres: insertion
middle of convexity of lateral surface of radius
pronator teres humeral head: origin
medial epicondyle of humerus
pronator teres: innervation
median nerve (C6, C7)
pronator teres: action
pronates and flexes forearm (at elbow)
pronator teres: blood supply
ulnar and radial arteries and veins
flexor carpi radialis: origin
medial epicondyle of humerus
flexor carpi radialis: insertion
base of 2nd (3rd) metacarpal
flexor carpi radialis: innervation
median nerve (C6, C7)
flexor carpi radialis: action
flexes and abducts hand (at wrist)
flexor carpi radialis: blood supply
ulnar and radial arteries, veins
palmaris longus: origin
medial epicondyle of humerus
palmaris longus: insertion
distal half of flexor retinaculum and apex of palmar aponeurosis
palmaris longus: innervation
median nerve (C7, C8)
palmaris longus: action
flexes hand at wrist and tenses palmar aponeurosis
palmaris longus: blood supply
ulnar and radial arteries and veins
flexor carpi ulnaris (humeral and ulnar head): origin
olecranon and posterior border via aponeurosis
flexor carpi ulnaris: insertion
pisiform, hook of hamate, 5th metacarpal
flexor carpi ulnaris: innervation
ulnar nerve (C7, C8)
flexor carpi ulnaris: action
flexes and adducts hand at wrist
flexor carpi ulnaris: blood supply
radial and ulnar arteries and veins
flexor digitorum superficialis humero-ulnar head: origin
medial epicondyle of humerus and coronoid process of ulna
flexor digitorum superficialis radial head: origin
oblique line of radius
flexor digitorum superficialis: insertion
shafts of middle phalanges of medial four fingers
flexor digitorum superficialis: innervation
median nerve (C7, C8, T1)
flexor digitorum superficialis: action
flexes proximal interphalangeal joints of middle four fingers; acting more strongly, it flexes proximal phalanges at metacarpophalangeal joints
flexor digitorum superficialis: blood supply
ulnar and radial arteries, veins
flexor digitorum profundus: origin
proximal threee quarters of medial and anterior surfaces of ulna and interosseous membrane
flexor digitorum profundus: insertion
bases of distal phalanges of 2nd, 3rd, 4th, and 5th digits
flexor digitorum profundus: innervation of the lateral part (2-3 digits)
median nerve (C8, T1) (anterior inertosseus branch)
flexor digitorum profundus: innervation of medial part (4-5 digits)
ulnar nerve (C8, T1)
flexor digitorum profundus: action
flexes distal interphalangeal joints of digits 2,3,4, and 5; assists w/ flexion
flexor digitorum profundus: blood supply
ulnar and radial arteries, veins
flexor pollices longus: origin
anterior surface of radius and adjacent interosseous membrane
flexor pollices longus: insertion
base of distal phalanx of thumb
flexor pollices longus: innervation
anterior interosseus nerve, from median nerve (C8, T1)
flexor pollices longus: action
flexes phalanges of thumb
flexor pollices longus: blood supply
ulnar and radial arteries, veins
pronator quadratus: origin
distal
pronator quadratus: insertion
distal quarter of anterior surface of radius
pronator quadratus: innervation
anterior interosseus nerve, from median nerve (C8, T1)
pronator quadratus: action
pronates forearm; deep fibers bind radius and ulna together
brachioradialis: orgin
proximal two thirds of supraepicondylar ridge of humerus
brachioradialis: insertion
lateral surface of distal end of radius proximal to styloid process
brachioradialis: innervation
radial nerve (C5, C6, C7)
brachioradialis: action
relatively weak flexion of forearm, maximal when forearm is in midpronated position
brachioradialis: blood supply
brachial and radial arteries, veins
extensor carpi radialis longus: origin
lateral supraepicondylar ridge of humerus
extensor carpi radialis longus: insertion
dorsal aspect of base of 2nd metacarpal
extensor carpi radialis longus: innervation
radial nerve (C6, C7)
extensor carpi radialis longus: action
extend and abduct hand at the wrist joint; extensor carpi radialis brevis active during fist clenching
extenor carpi radialis longus: blood supply
radial and brachial arteries, veins
extensor carpi radialis brevis: origin
lateral epicondyle of humerus (common extensor origin)
extensor carpi radialis brevis: insertion
dorsal aspect of base of 3rd metacarpal
extensor carpi radialis brevis: innervation
deep branch of radial nerve (C7, C8)
extensor carpi radialis brevis: action
extend and abduct hand at the wrist joint & active during fist clenching
extensor digitorum: origin
lateral epicondyle of humerus
extensor digitorum: insertion
extensor expansions of medial four fingers
extensor digitorum: innervation
posterior interosseus nerve (C7, C8), continuation of deep branch of radial nerve
extensor digitorum: action
extends medial four fingers primarily at metacarpophalangeal joints, secondarily at interphalangeal joints
extensor digitorum: blood supply
anterior and posterior interosseous arteries, veins
extensor carpi radialis brevis: blood supply
anterior and posterior interosseous artery, vein
extensor digiti minimis/quinti: origin
lateral epicondyle of humerus
extensor digit minimis/quinti: insertion
extensor expansion of pinky
extensor digiti minimis/quinti: innervation
posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
extensor digiti minimis/quinti: action
extends pinky finger primarily at metacarpophalangeal joint, secondarily at interphalangeal joint
extensor carpi ulnaris: origin
lateral epicondyle of humerus; posterior border of ulna via a shared aponeurosis
extensor carpi ulnaris: insertion
dorsal aspect of base of pinky finger metacarpal
extensor carpi ulnaris: innervation
posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
extensor carpi ulnaris: action
extends and adducts hand at wrist joint (also active during fist clenching)
extensor carpi ulnaris: blood supply
anterior and posterior interosseous artery, vein
supinator: origin
lateral epicondyle of humerus; radial collateral and anular ligaments; supinator fossa; crest of ulna
supinator: insertion
lateral, posterior, and anterior surfaces of proximal third of radius
supinator: innervation
deep branch of radial nerve (C7, C8)
supinator: action
supinates forearm; rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)
supinator: blood supply
anterior and posterior interosseous artery and vein
abductor pollicis longus: origin
posterior surface of proximal halves of ulna, radius, and interosseous membrane
abductor pollicis longus: innervation
posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
abductor pollicis longus: action
abducts thumb and extends it at carpometacarpal joints
abductor pollicis longus: blood supply
anterior and posterior interosseous artery and vein
extensor pollicis brevis: origin
posterior surface of distal third of radius and interosseous membrane
extensor pollicis brevis: insertion
dorsal aspect of base of proximal phalanx of thumb
extensor pollicis brevis: innervation
posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
extensor pollicis brevis: action
extends proximal phalanx of thumb at metacarophalangeal joint; extends carpometacarpal joint
extensor pollicis brevis: blood supply
anterior and posterior interosseous artery and vein
extensor pollicis longus: origin
posterior surface of middle third of ulna and interosseous membrane
extensor pollicis longus: insertion
dorsal aspect of base of distal phalanx of thumb
extensor pollicis longus: innervation
posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
extensor pollicis longus: action
extends distal phalanx of thumb at interphalangeal joint; extends metacarpophalangeal and carpometacarpal joints
extensor pollicis longus: blood supply
anterior and posterior interosseous artery, vein
extensor indicis: origin
posterior surface of distal third of ulna and interosseous membrane
extensor indicis: insertion
extensor expansion of index (2nd) finger
extenor indicis: innervation
posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
extensor indicis: action
extends index finger (enabling its independent extension); helps extend hand at wrist
abductor pollicis brevis: origin
flexor retinaculum and tubercles of scaphoid and trapezium
abductor pollicis brevis: insertion
lateral side of base of proximal phalanx of thumb
abductor pollicis brevis: innervation
recurrent branch of medial nerve (C8, T1)
abductor pollicis brevis: action
abducts thumb; helps oppose it
abductor pollicis brevis: blood supply
radial artery and dorsal venous network of veins
flexor pollicis brevis: origin
flexor retinaculum and tubercles of scaphoid and trapezium
flexor pollicis brevis: insertion
lateral side of base of proximal phalanx of thumb
flexor pollicis brevis: innervation
recurrent branch of medial nerve (C8, T1)
flexor pollicis brevis: action
flexes thumb
flexor pollicis brevis: blood supply
radial artery and dorsal venous network of veins
opponens pollicis: origin
flexor retinaculum and tubercles of scaphoid and trapezium
opponens pollicis: innervation
recurrent branch of medial nerve (C8, T1)
adductor pollicis oblique head: origin
bases of 2nd and 3rd metacarpals, capitate, adjacent carpals
adductor pollicis: innervation
deep branch of ulnar nerve (C8, T1)
adductor pollicis: action
adducts thumb toward lateral border of palm
adductor pollicis: blood supply
radial artery and dorsal venous network of veins
abductor digiti minimi: origin
pisiform
abductor digiti minimi: insertion
medial side of base of proximal phalanx of pinky finger
abductor digiti minimi: innervation
deep branch of ulnar nerve (C8, T1)
abductor digiti minimi: action
abducts pinky finger, assists in flexion of its proximal phalanx
flexor digiti minimi brevis: origin
hook of hamate and flexor retinaculum
flexor digiti minimi brevis: insertion
medial side of base of proximal phalanx of pinky finger
flexor digiti minimi brevis: innervation
deep branch of ulnar nerve (C8, T1)
flexor digiti minimi brevis: action
flexes proximal phalanx of pinky finger

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