Muscle Actions -- Kinesiology

anterior deltoid

shoulder flexion, horizontal adduction

middle deltoid

shoulder abduction

posterior deltoid

shoulder extension, horizontal abduction

supraspinatus

shoulder abduction

infraspinatus

shoulder external rotation

teres minor

shoulder external rotation

subscapularis

shoulder internal rotation

teres major

shoulder extension, adduction, internal rotation

coracobrachialis

shoulder flexion

latissimus dorsi

shoulder extension, adduction, internal rotation

pec major clavicular

shoulder flexion, internal rotation, horizontal adduction

pec major sternal

shoulder adduction, internal rotation, horizontal adduction

biceps brachii

assist shoulder flexion and abduction

triceps brachii

assists shoulder extension and adduction

serratus anterior

scapular abduction (protraction), upward rotation (with others)

upper trapezius

scapular elevation, upward rotation (with others)

middle trapezius

scapular adduction (retraction)

lower trapezius

scapular depression, upward rotation (with others)

serratus anterior, upper trapezius, lower trapezius (some middle traps)

scapular upward rotation

rhomboids

scapular elevation and adduction (retraction)

pectoralis minor

scapular depression and upward tilt

levator scapula

scapular elevation and downward rotation

biceps brachii

elbow flexion and supination

brachialis

elbow flexion

brachioradialis

elbow flexion

pronator quadratus

elbow pronation

pronator teres

elbow pronation

triceps brachii

elbow extension

anconeus

elbow extension

supinator

elbow supination

flexor carpi ulnaris

wrist flexion and ulnar deviation

flexor carpi radialis

wrist flexion and radial deviation

palmaris longus

wrist flexion

ext. carpi radialis longus

wrist extension and radial deviation

ext. carpi radialis brevis

wrist extension

ext. carpi ulnaris

wrist extension and ulnar deviation

extensor digitorum

MCP, PIP, and DIP extension

extensor digiti minimi

finger extension

dorsal interossei (DAB’s)

finger MCP abduction

palmar interossei (PAD’s)

finger MCP adduction

abductor digiti minimi

pinky mCP abduction

flexor digiti minim

pinky MCP flexion

opponens digiti minimi

pinky opposition

extensor pollicis brevis

thumb extension at MCP joint

thumb extension and abduction at CMC joint

abductor pollicis brevis

thumb abduction at CMC and MCP joint

flexor pollicis brevis

thumb flexion at CMC and MCP joint

flexor digitorum superficialis

PIP flexion

flexor digitorum profundus

DIP flexion

extensor digitorum

finger MCP, PIP, and DIP extension

extensor indicis

index finger MCP, PIP, and DIP extension

extensor digiti minimi

pinky MCP, PIP, and DIP extension

lumbricales

MCP flexion, PIP and DIP extension

extensor pollicis longus

thumb interphalangeal extension

extensor pollicis brevis

thumb extension and abduction at CMC joint

thumb extension at MCP joint

abductor pollicis longus

thumb extension and abduction at CMC joint

abductor pollicis longus

thumb abduction at CMC and MCP joint

flexor pollicis brevis

thumb flexion at CMC and MCP joint

adductor pollicis

thumb adduction at CMC and MCP joint

opponens pollicis

thumb opposition at CMC joint