Exam 3 UE Muscles

lesser tubercle of humerus

Subscapularis insertion

radial nerve C5, C6, C7

brachioradialis innervation

anterior interosseous nerve from median nerve C8-T1

Flexor digitorum profundus later innervation

median nerve C7, C8, T1

flexor digitorum superficialis: humero-ulnar head and radial head innervation

axillary nerve C5 and C6

teres minor innervation

upper and lower subscapular nerves C5, C6, C7

Subscapularis innervation

radial nerve C7, C8, T1

anconeus innervation

anconeus

Action: assists triceps in extending forearm, stabilize elbow joint, may abduct ulna during pronation

extensor indicis

action: extension of the second digit (index finger)

teres minor

action: laterally rotates the arm

extensor pollicis brevis

innervation: posterior interosseous nerve C7, C8 continuation of deep branch of radial nerve

pronator teres

action: pronates and flexes forearm at elbow

supinator

action: supination of the forearm

extensor pollicis longus

innervation: posterior interosseous nerve C7, C8 continuation of deep branch of radial nerve

infraspinous fossa of scapula

infraspinatus origin

middle facet of greater tubercle of humerus

infraspinatus insertion

ulanr nerve C8 and T1

flexor digitorum profundus medial part innervation

flexor digitorum profundus lateral

action: flexes distal phalanges 2 and 3 at distal interphalangeal joint

supraspinatus

action: abduction of arm

flexor carpi radialis

action: flexes and abducts hand at wrist

radial nerve C6,C7,C8

supinator innervation

subscapular fossa

Subscapularis origin

pronator quadratus

action: pronates forearm

radial nerve C6, C7, C8

Triceps brachii innervation

extensor digitorum communis

Innervation: deep branch of radial nerve C7, C8

infraspinatus

action: laterally rotates the arm

abductor pollicis longus

innervation: posterior interosseous nerve C7, C8 continuation of deep branch of radial nerve

brachialis

innervation: musculocutaneous nerve C5 and C6 and radial nerve C5 and C7

extensor pollicis brevis

action: extends proximal phalanx of thumb at metacarpophalangeal joint, extends carpometacarpal joint

extensor digitorum communis

action: extends medial 4 digits primarily at metacarpophalangeal joints, secondarily at interphalangeal joints

biceps brachii

action: supinates forearm and when supine flexes forearm

flexor digitorum profundus

action: flexes distal phalanges 4 and 5 at distal interphalangeal joint (medial)

supraspinatus

innervation: suprascapular nerve C4, C5, C6

brachialis

action: flexes forearm in all positions

infrapsinatus

innervation: suprascapular nerve C5 and C6

teres minor

insertion: inferior facet of greater tubercle of humerus

extensor digitorum minimi

innervation: deep branch of radial nerve C7 and C8

palmaris longus

innervation: median nerve C7 and C8

teres minor

origin: middle part of lateral border of scapula

flexor digitorum superficialis

action: flexes middle phalanges at proximal interphalangeal joint of middle 4 digits. Flexes proximal phalanges at metacarpophalangeal joints (humero-ulnar head and radial head)

subscapularis

action: medially rotates the arm

flexor pollicis longus

innervation: anterior interosseous nerve from median nerve C8-T1

supraspinatus

origin: supraspinous fossa of scapula

supraspinatus

insertion: superior facet of greater tubercle of humerus

biceps brachii

innervation: musculocutaneous nerve C5, C6, and C7

triceps brachii

action: main extensor of forearm

pronator teres

innervation: median nerve C6 and C7 (ulnar and humeral head)

flexor carpi radialis

innervation: median nerve C6 and C7

palmaris longus

action: flexes hand at wrist and tenses palmar aponeurosis

flexor carpi ulnaris

innervation: ulnar nerve C7 and C8 (ulnar and humeral head)

flexor carpi ulnaris

action: flexes and adducts hand at wrist (ulnar and humeral head)

pronator quadratus

innervation: anterior interosseous nerve from median nerve C8-T1

flexor pollicis longus

flexes phalanges of first digit (thumb)

brachioradialis

action: flexion of freedom

extensor digitorum minimi

action: extends 5th digit primarily at metacarpophalangeal joint, secondly at interphalangeal joint

extensor carpi ulnaris

innervation: deep branch of radial nerve C7 and C8

extensor carpi ulnaris

action: extends and adducts hand at wrist joint

abductor pollicis longus

action: abducts thumb and extends it at carpometacarpal joint

extensor pollicis longus

action: extends distal phalanx of thumb at interphalangeal joint, extends metacarpophalangeal and carpometacarpal joint

extensor indicis

innervation: radial nerve C6, C7, C8