Muscle Actions- Upper Extremity Flashcards
Latissimus Dorsi
humeral adduction, extension & medial rotation
Levator Scapulae
elevation & inferior rotation of the lateral angle of the scapula
Pectoralis Major
humeral adduction, flexion & medial rotation
Pectoralis Minor
scapular protraction & assists with depression of the shoulder (assists with forced inspiration [with scapular fixation])
Rhomboids
scapular retraction & inferior rotation of the lateral angle
Serratus Anterior
scapular protraction & upward rotation of the lateral angle of the scapula
Trapezius
scapular elevation, depression, retraction & superior rotation of the lateral angle
Deltoid
humeral flexion, medial rotation, abduction, extension & lateral rotation
Subscapularis
stabilizes the glenohumeral joint, and medially rotates & adducts humerus
Supraspinatus
initiates humeral abduction
Teres Major
humeral adduction & medial rotation
Infraspinatus
stabilizes glenohumeral joint, and lateral rotation of humerus
Teres Minor
stabilizes glenohumeral joint, and lateral rotation of humerus
Biceps Brachii
flexion of the arm & forearm, & supination of the forearm
Brachialis
flexion of the forearm
Coracobrachialis
flexion & adduction of arm
Triceps Brachii
extension of the arm (long head) & extension of the forearm (long, lateral & medial heads)
Abductor Pollicis Longus
abducts and extends thumb at carpometacarpal joint
Brachioradialis
flexes forearm
Extensor carpi radialis brevis
extends & abducts hand at wrist
Extensor carpi radialis longus
extends & abducts hand at wrist
Extensor carpi ulnaris
extends & adducts hand at wrist
Extensor digitorum
extends phalanges (MP) and hand at wrist
Extensor digiti minimi
extends 5th digit (MP & IP)
Extensor indicis
extends 2nd digit (MP & IP)
Extensor pollicis brevis
extends thumb (MP)
Extensor pollicis longus
extends thumb (MP & IP)
Flexor carpi radialis
flexes & abducts hand at wrist
Flexor carpi ulnaris
flexes & adducts hand at wrist
Flexor digitorum profundus
flexion of digits 2-5 (MP & IP), and flexion hand at wrist
Flexor digitorum superficialis
flexion of digits (MP & proximal IP), and hand at wrist
Flexor pollicis longus
flexes thumb (MP & IP)
Palmaris longus
flexes hand at wrist
Pronator Quadratus
pronates the forearm
Pronator Teres
pronates & flexes forearm
Supinator
supinates forearm
Abductor digiti minimi
abducts 5th digit
Abductor pollicis brevis
abducts thumb
Adductor pollicis
adducts thumb
Dorsal interossei
abducts (MP), flexes (MP) & extends (IP) digits 2-4
Flexor digiti minimi brevis
flexes (MP) 5th digit
Flexor pollicis brevis
flexes (MP) thumb
Lumbricals
flexes (MP) and extends (IP) digits 2-5
Opponens digiti minimi
opposition of 5th digit to thumb
Opponens pollicis
opposition of thumb to 5th digit
Palmar Interossei
adducts (MP), flexes (MP) & extends (IP) digits 2, 4 & 5