Muscle Actions Flashcards
Subscapularis
Medial rotation of the humerus
Adduction of shoulder
Reinforce glenohumeral joint
Teres Minor
Lateral shoulder rotation
Reinforce glenohumeral joint
Infraspinatus
Lateral shoulder rotation
Reinforce glenohumeral joint
Supraspinatus
Abduct shoulder
Reinforce glenohumeral joint
Teres Major
Adduction of the shoulder
Medial rotation of the humerus
Deltoid
Shoulder abductor
Shoulder flexor
Shoulder extender
Semispinalis
Extends the head, C, and T
Rotates T and C regions
Splenius
Flex the neck, rotate the head
Longissimus
Extend vertebral column and head, eccentric back flexion.
Flexes vertebral column if unilateral
Spinalis
Extend vertebral column and head, eccentric back flexion.
Flexes vertebral column if unilateral
Iliocostalis
Extend vertebral column and head, eccentric back flexion.
Flexes vertebral column if unilateral
Levator Scapulae
Elevates scapula
Rhomboid Major
Retract scapula, weak elevation
Rhomboid Minor
Retract scapula, weak elevation
Latissimus Dorsi
Extend shoulder, adduct should, medial rotation of the humerus
Trapezius
Elevate, depress, and retract the scapula
Biceps brachii
Elbow flexion, Arm flexion, supination
Coracobrachialis
Flex shoulder
Brachialis
Flex elbow
Triceps brachii
Extend shoulder, extend elbow
Pronator teres
pronate arm, weak elbow flexion
Flexor carpi radialis
flex, abduct wrist
palmaris longus
flex hand, weak elbow flexion
flexor carpi ulnaris
flex wrist, adduct hand
brachioradialis
weak elbow flexor
flexor digitorum superficialis
flex PIP joint and metacarpophalangeal joint, poor elbow flexion
Flexor pollicis longus
flex thumb
pronator quadratus
pronation
flexor digitorum profundus
flex distal IP joint, assist with wrist flexion
extensor carpi radialis longus
extend, abduct wrist
extensor carpi radialis brevis
extend, abduct wrist
extensor digitorum
extend wrist, extend metacarpophalangeal joints and interphalangeal joints
extensor carpi ulnaris
extend and adduct wrist
supinator
supination, rotate radius to turn palm
abductor pollicis longus
extend wrist, abduct thumb, extend carpometacarpal joint
extensor pollicis brevis
extend wrist, extend prox pollic phalanx, extend carpometacarpal joint
extensor pollicis longus
extend wrist, extend distal pollic phalanx, extend carpometacarpal joint
extensor indicis
extend wrist, extend index finger
Opponens pollicis
draws metacarpal 1 in medially and rotates it
abductor pollicis brevis
abducts thumb, aids in opposition
flexor pollicis brevis
flexes thumb
adductor pollicis
adducts thumb
abductor digiti minimi
abducts 5th digit
flexor digiti minimi
flexes proximal phalanx of 5th finger
opponens digiti minimi
draws 5th metacarpal anteriorally and rotates it for opposition
lumbricals
flex metacarpophalangeal joints, extend interphalangeal joints of digits 2-5
dorsal interossei
abduct digits 2-4, flex metacarpophalangeal joints, extend interphalangeal joints
palmer interossei
adduct digits 2, 4, 5, flex metacarpophalangeal joints, extend interphalangeal joints
palmaris brevis
wrinkles palmar skin during grip