Upper Extremity Actions and Innervations Flashcards
Pectoralis Major
A: adduct and medially rotate humerus protract and depress scapula flex humerus extend humerus from flexed state N: lateral and medial pectoral nerves
pectoralis minor
A: stabilize scapula by protracting and depressing it against the thoracic wall
N: medial pectoral n
subclavius m.
A: positions and depresses the clavicle
N: nerve to the subclavius m.
serratus anterior m.
A: protracts the scapula which stabilizes it against thoracic wall, rotations glenoid cavity superiorly
N: long thoracic n.
deltoid m
A: flexes and medially rotates the humerus (anterior part)
abducts the humerus (medial part)
extends and laterally rotates the humerus (posterior part)
N: axillary n.
subscapularis
A: medially rotates and adducts the humerus
holds humerus head in glenoid cavity
N: upper and lower subscapular n.
supraspinatus m.
A: abducts humerus (with deltoid) and holds humeral head in glenoid cavity
N: suprascapular n.
infraspinatus m.
A: laterally rotates the humerus
holds humeral head in glenoid cavity
N: suprascapular n.
teres minor m.
A: laterally rotates humerus
holds humeral head in glenoid cavity
N: axillary n.
teres major m.
A: adducts and medially rotates humerus
N: lower subscapular n.
biceps brachii m.
A: flexes humerus flexes supine forearm supinates the forearm short head resists dislocation of shoulder N: musculocutaneous n.
coracobrachialis m.
A: flexes and adducts humerus
N: musculocutaneous n.
brachialis m.
A: flexes forearm
N: musculocutaneous n.
triceps brachii m.
A: extends forearm
long head resists dislocation of shoulder
N: radial n.
aconeus
A: extends forearm (with triceps brachii)
stabilizes elbow joint
N: radial n.
pronator teres m.
A: pronates and flexes forearm
N: median n.
flexor carpi radialis m.
A: flexes forearm
flexes and abducts hand at the wrist
N: median n.
palmaris longus m.
A: flex forearm
flex hand
tense palmar aponeurosis
N: median n.
flexor carpi ulnaris m.
A: flex forearm
flex and adduct hand at wrist
N: ulnar n.
flexor digitorum superficialis m.
A: flex forearm
flex hand at wrist
flex proximal and intermediate phalanges of digits 2-5 at metacarpophalangeal and proximal interphalangeal joints
N: median n.
flexor digitorum profundus m.
A: flex hand at wrist
flex all phalanges of digits 2-5 at metacarpophalangeal, proximal, and distal interphalangeal joints
N: anterior interosseus n. (lateral part) and ulnar n. (medial part)
flexor pollicis longus m.
A: flex hand
flex and abduct 1st metacarpal at the 1st carpometacarpal joint
flex both phalanges of pollux at intercarpal joint
N: anterior interosseus n
pronator quadratus m.
A: pronate forearm
holds ulna and radius together
N: anterior interosseus n.
brachioradialis m.
A: flex forearm (most force when forearm is midpronated)
N: radial n.
extensor carpi radialis longus m.
A: extend and abduct hand at wrist
N: radial nerve
extensor carpi radialis brevis m.
A: extend and abduct hand at wrist
N: deep radial n.
extensor digitorum m.
A: extend hand at wrist
extend all phalanges of digits 2-5 at the metacarpophalangeal, proximal, and distal interphalangeal joints
N: posterior interosseus n.
extensor digiti minimi m.
A: extend all phalanges of digit 5 at metacarpophalangeal, proximal, and distal interphalangeal joints
N: posterior interosseus n.
extensor carpi ulnaris m.
A: Extend and ADduct Hand at the Wrist
N: posterior interosseus n.
supinator m.
A: supinate forearm
N: deep radial n.
extensor indicis m.
A: extend hand at wrist
extend 2nd digit
N: posterior interosseus n.
abductor pollicis longus m.
A: abduct hand at wrist
abduct pollux at carpometacarpal joint
N: posterior interosseus n
extensor pollicis longus m.
A: abduct hand at wrist
extend 1st metacarpal, proximal, and distal phalanges of pollux at carpometacarpal, metacarpophalangeal, and interphalangeal joint
N: posterior interosseus n.
extensor pollicis brevis m.
A: ABduct hand, Extend 1st Metacarpal and Proximal
Phalanges of the Pollux at the Carpometacarpal and
Metacarpophalangeal Joints
N: posterior interosseus n.
abductor pollicis brevis m.
A: abduct pollux
aids in opposition
N: recurrent branch of median n.
opponens pollicis m.
A; oppose pollux
N: recurrent branch of median n
flexor pollicis brevis m.
A: Flex 1st Metacarpal and Proximal Phalanges of the
Pollux at the Carpometacarpal and Metacarpophalangeal
Joints
N: recurrent branch of median n. (superficial head) and deep ulnar n. (deep head)
adductor pollicis m.
A: adduct pollux
N: deep ulnar n.
abductor digiti minimi m.
A: abduct 5th digit
N: deep ulnar n.
flexor digiti minimi brevis m.
A: flex proximal phalanx of 5th digit
N: deep ulnar n.
opponens digiti minimi m.
A: oppose 5th digit
N: deep ulnar n.
1st and 2nd lumbrical m.
A: Flex Proximal Phalanges of the 2nd and 3rd Digits at the Metacarpophalangeal Joint
Extend Intermediate and Distal Phalanges of the 2nd and 3rd Digits by tightening extensor expansion
N: median n.
3rd and 4th lumbrical m.
A: Flex Proximal Phalanges of the 4th and 5th Digits at the
Metacarpophalangeal Joint
Extend Intermediate and Distal Phalanges of the 4th and 5th Digits by tightening extensor expansion
N: deep ulnar n.
dorsal interossei m.
A: abduct digits 2-4; flex proximal phalanges at the metacarpophalangeal joint
extend intermediate and distal phalanges by tightening extensor expansion
N: deep ulnar n.
palmar interossei m.
A: ADduct 2nd, 4th and 5th Digits
flex Proximal Phalanges of the 2nd, 4th and 5th Digits at the Metacarpophalangeal Joint
Extend Intermediate and Distal Phalanges of the 2nd, 4th and 5th Digits by tightening extensor expansion
N: deep ulnar n.
