Upper Extremity - Action Flashcards
What is the action of the latissimus dorsi muscle?
Extensor, adductor and medial rotator of the arm
What is the action of the trapezius muscle?
Upper and lower fibers - abduction of the arm
Upper fibers - elevate shoulder; brace for weight-bearing
Central fibers - retract shoulder
Lower fibers - depresses scapula
Both muscles - adduction of arm
What is the action of the deltoid?
Principal - abduction of arm
Anterior fibers - flexor and medial rotator
Posterior fibers - extensor and lateral rotator
What is the action of the supraspinatus?
Abduction and lateral rotation of the arm
What is the action of the infraspinatus?
Lateral rotator of the arm
What is the action of the teres minor?
Lateral rotator and weak adductor of the arm
What is the action of the teres major?
Extensor, adductor and medial rotator of the arm
What is the action of the subscapularis?
Medial rotator and adductor of the arm
What is the action of the pectorals major?
Adductor, flexor and medial rotator of the arm
What is the action of the biceps brachii?
Supinator; flexor (when supinated)
What is the action of the coracobrachialis?
Flexor and adductor of the arm
What is the action of the brachialis?
Flexor of the forearm
What is the action of the triceps brachii?
Extensor of the forearm
Long head - extensor of the arm
What is the action of the anconeus?
Extensor of the forearm; abductor of the ulna (pronated)
What is the action of the pronator teres?
Flexor and rotator of the forearm
What is the action of the pronator quadratus?
Pronator of the forearm
What is the action of the flexor carpi radialis?
Flexor of the hand; abductor of the wrist
What is the action of the palmaris longus?
Flexor of the hand; tightens palmar aponeurosis
What is the action of the flexor carpi ulnaris?
Flexor and adductor of the hand
What is the action of the flexor digitoxin superficialis?
Flexor at the PIPs, MCPs and wrist joints
What is the action of the flexor digitorum profundus?
Primary - flexor of the DIPs
What is the function of the flexor pollicis longus?
Primary - flexor of the distal phalanx of thumb
What is the action of the supinator?
Supinator of the arm
What is the function of the brachioradialis?
Accessory flexor of the forearm
What is the action of the extensor carpi radialis longus?
Extensor and abductor of the hand
What is the action of the extensor carpi radialis brevis?
Extensor and abductor of the hand
What is the action of the extensor digitorum?
Extension of digits at the IP and MCP joints and wrist
What is the action of the extensor digiti minimi?
Extensor of the 5th digit at the IP and MCP joints and wrist
What is the action of the extensor carpi ulnaris?
Extensor and adductor of the hand
What is the action of the abductor pollicis longus?
Abductor, extensor and lateral rotator of the thumb
What is the action of the extensor pollicis brevis?
Extensor of the PP of thumb at MCP and metacarpal at CMC joint
What is the action of the extensor pollicis longus?
Extensor of the thumb at the MCP and IP joints; abductor of the thumb
What is the action of the extensor indicis?
Extensor of the 2nd digit
What is the action of the abductor pollicis brevis?
Abductor of the CMC and MCP joints of the thumb
What is the action of the flexor pollicis brevis?
Flexor of the thumb at the MCP joint; medial rotator of the 1st metacarpal
What is the action of the opponent pollicis?
Medial rotator of the 1st metacarpal
What is the action of the adductor pollicis?
Adductor of the proximal phalanx of thumb towards middle digit
What is the action of the abductor digiti minimi?
Abduction of the 5th digit
What is the action of the flexor digiti minimi brevis?
Flexor of the proximal phalanx of 5th digit at MCP joint
What is the action of the opponents digiti minimi?
Abductor, flexor and lateral rotator of 5th metacarpal
What is the action of the lumbricals?
Flexor at the MCP joint; extensor at the IP joints
What is the action of the dorsal interposed muscles?
Abductor of the fingers; extensor of distal phalanges; flexor at the MCP joint
What is the action of the palmar interossei?
Adductor of the fingers; flexor at the MCP; extensor of the distal phalanges