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Muscle Actions

What muscles do.

QuestionAnswer
gh shoulder flexion DELTOID (ANTERIOR), DELTOID (LATERAL), PECTORALIS MAJOR (CLAVICULAR HEAD), CORACOBRACHIALIS, biceps brachii (short head)
gh shoulder extension LATS, DELTOID (POSTERIOR), PECTORALIS MAJOR (STERNAL HEAD), teres major, triceps brachii (long head)
gh shoulder adduction LATS, PEC MAJOR (STERNAL HEAD), pec major (clavicular head), teres major, coracobrachialis, triceps (long head)
gh shoulder abduction DELTOID (LATERAL AND ANTERIOR), SUPRASPINATUS, pec major (clavicular head)
gh shoulder transverse adduction PEC MAJOR (STERNAL AND CLAVICULAR HEAD), CORACOBRACHIALIS
gh shoulder transverse flexion PEC MAJOR (STERNAL AND CLAVICULAR HEAD), DELTOID (ANTERIOR), CORACOBRACHIALIS, biceps (short head)
gh shoulder transverse abduction DELTOID (POSTERIOR AND LATERAL), infraspinatus, teres minor
gh shoulder transverse extension DELTOID (POSTERIOR), lats, infraspinatus, teres minor
gh shoulder IR PEC MAJOR (STERNAL AND CLAVICULAR HEAD), LATS, DELTOID (ANTERIOR), subscapularis, teres major, supraspinatus (when shoulder is flexed)
gh shoulder ER TERES MINOR, INFRASPINATUS, DELTOID (POSTERIOR), supraspinatus (when shoulder is abducted)
sc, ac, and cc abduction (protraction) SERRATUS ANTERIOR, PEC MINOR, levator scap, pec major (sternal head)
sc, ac, and cc adduction (retraction) TRAP (MIDDLE AND LOWER), RHOMBOIDS, lats
sc, ac, and cc depression PEC MINOR, LATS, pec major, trap (lower)
sc, ac, and cc elevation TRAP (UPPER AND MID), LEVATOR SCAP, serratus anterior (upper fibers)
sc, ac, and cc upward rotation (superior rotation) TRAP (MID AND LOWER), SERRATUS ANTERIOR (LOWER FIBERS)
sc, ac, and cc downward rotation (inferior rotation) LEVATOR SCAP, RHOMBOIDS, PEC MINOR, pec major, lats
elbow flexion BRACHIALIS, BICEPS, BRACHIORADIALIS
elbow extension TRICEPS BRACHII, ANCONEUS
radioulnar pronation PRONATOR QUADRATUS, PRONATOR TERES, flexor carpi radialis, anconeus
radioulnar supination SUPINATOR, BICEPS
wrist and metacarpal flexion FLEXOR CARPI RADIALIS, FLEXOR CARPI ULNARIS, palmaris longus, abductor pollicis longus, flexor digitorum profundus, flexor digitorum superficialis, flexor pollicis longus
wrist and metacarpal extension EXTENSOR CARPI RADIALIS LONGUS, EXTENSOR CARPI ULNARIS, extensor digitorum, extensor pollicis longus, extensor indicis, extensor digiti minimi
wrist and metacarpal ulnar deviation (adduction) FLEXOR CARPI ULNARIS, EXTENSOR CARPI ULNARIS
wrist and metacarpal radial deviation (abduction) EXTENSOR CARPI RADIALIS LONGUS, EXTENSOR CARPI RADIALIS BREVIS, FLEXOR CARPI RADIALIS, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus
finger metacarpophalangeal flexion FLEXOR DIGITORUM PROFUNDUS, FLEXOR DIGITORUM SUPERFICIALIS, FLEXOR DIGITI MINIMI, abductor digiti minimi, interossei, lumbricals
finger metacarpophalangeal extension EXTENSOR DIGITIORUM (MIDDLE AND RING FINGERS), EXTENSOR DIGITI MINIMI, EXTENSOR INDICIS
finger metacarpophalangeal adduction PALMAR INTEROSSEI (IN THE EXTENDED FINGER), FLEXOR DIGITORUM SUPERFICIALIS, FLEXOR DIGITORUM PROFUNDUS
finger metacarpophalangeal abduction DORSAL INTEROSSEI (IN THE EXTENDED FINGER), EXTENSOR DIGITORUM, EXTENSOR DIGITI MINIMI, ABDUCTOR DIGITI MINIMI, extensor indicis
finger interphalangeal flexion FLEXOR DIGITORUM PROFUNDUS, FLEXOR DIGITORUM SUPERFICIALIS (PROXIMAL JOINT ONLY)
finger interphalngeal extension EXTENSOR DIGITORUM, EXTENSOR DIGITI MINIMI, EXTENSOR INDICIS, LUMBRICALS, INTEROSSEI
thumb carpometacarpal flexion FLEXOR POLLICIS BREVIS, FLEXOR POLLICIS LONGUS, oppenens pollicis
thumb carpometacarpal extension EXTENSOR POLLICIS LONGUS, EXTENSOR POLLICIS BREVIS, ABDUCTOR POLLICIS LONGUS
thumb carpometacarpal adduction ADDUCTOR POLLICIS, 1ST DORSAL INTEROSSEOUS, extensor pollicis longus, flexor pollicis longus
thumb carpometacarpal abduction ABDUCTOR POLLICIS LONGUS, ABDUCTOR POLLICIS BREVIS
thumb carpometacarpal opposition OPPONENS POLLICIS, ABDUCTOR POLLICIS BREVIS, flexor pollicis longus, adductor pollicis
thumb metacarpophalangeal flexion FLEXOR POLLICIS LONGUS, FLEXOR POLLICIS BREVIS, 1st palmar interosseous, abductor pollicis brevis
thumb metacarpophalangeal extension EXTENSOR POLLICIS LONGUS, EXTENSOR POLLICIS BREVIS
thumb metacarpophalangeal adduction ADDUCTOR POLLICIS, 1ST PALMAR INTEROSSEOUS
thumb metacarpophalangeal abduction ABDUCTOR POLLICIS BREVIS
thumb interphalangeal flexion FLEXOR POLLICIS LONGUS
thumb interphalangeal extension EXTENSOR POLLICIS LONGUS, abductor pollicis brevis, adductor pollicis
neck (atlantoccipital & antlantoaxial) flexior LONGUS CAPITIS, RECTUS CAPITIS ANTERIOR, STERNOCLEIDOMASTOID (ANTERIOR FIBERS)
neck (atlantoccipital & antlantoaxial) extension SEMISPINALIS CAPITIS, SPLENUS CAPITIS, RECTUS CAPITIS POSTERIOR MAJOR, RECUS CAPITIS POSTERIOR MINOR, OBLIQUUS CAPITIS SUPERIOR, LONGISSIMUS CAPITIS, upper trap, scm (posterior fibers)
neck (atlantoccipital & antlantoaxial) lateral flexion (abduction), reduction (adduction), and rotation SCM, OBLIQUUS CAPITIS INFERIOR, OBLIQUUS CAPITIS SUPERIOR, RECTUS CAPITIS LATERALIS, LONGISSIMUS CAPITIS, SPLENIUS CAPITIS, semispinalis capitis, upper trap
spine (cervical) flexion SCM, LONGUS COLLI, LONGUS CAPITIS
spine (cervical) extension SPLENIUS, SEMISPINALIS CAPITIS, SEMISPINALIS CERVICIS, ILIOCOSTALIS CERVICIS, LONGISSIMUS CAPITIS, LONGISSIMUS CERVICIS, upper trap, interspinales
spine (cervical) lateral flexion (abduction), reduction (adduction), and rotation SCM, SCALENE, SPENIUS, LONGISSIMUS CAPITIS, LONGISSIMUS CERVICIS, MULTIFIDUS, levator scapulae, longus colli, intertrasversarii
spine (thoracic, lumbar) flexion RECTUS ABDOMINIS, obliques
spine (thoracic, lumbar) extension ERECTOR SPINAE, quadratus lumborum, lower trap
spine (thoracic, lumbar) lateral flexion (abduction), reduction (adduction), rotation OBLIQUES, PSOAS MAJOR, QUADRATUS LUMBORUM, MULTIFIDUS, ILIOCASTALIS LUMBORUM, ILIOCASTALIS THORACIS, ROTATORES, intertransversarii
hip flexion ILIOPSOAS, TENSOR FASCIAE LATAE, RECTUS FEMORIS, sartorius, adductor longus, adductor brevis, pectineus
hip extension GLUT MAX, SEMITENDIUNOSUS, SEMIMEMBRANOSUS, BICEPS FEMORIS (LONG HEAD), adductor magnus (ischial fibers)
hip adduction ADDUCTORS, pectineus, gracilis, glut max (lower fibers)
hip abduction GLUTEUS MEDIUS, GLUTEUS MINIMUS, tensor fasciae latae, sartorius
hip transverse adduction ADDUCTORS, pectineus, gracilis
hip transverse abduction GLUT MAX, GLUT MED, GLUT MINIMUS, piriformis, obturator externus
hip IR TENSOR FASCIAE LATAE, GLUT MED, GLUT MINIMUS (ANTERIOR FIBERS), piriformis (w/ hip flexed)
hip ER GEMELLUS SUPERIOR, GEMELLUS INFERIOR, OBTURATOR INTERNUS, OBTURATOR EXTERNUS, QUADRATUS FEMORIS, piriformis, glut max, sartorius, glut med (posterior fibers)
knee flexion HAMSTRINGS, gracilis, sartorius, popliteus, gastocnemius
knee extension QUAD FEMORIS
knee IR POPLITEUS, SEMIMEMBRANOSUS, SEMITENDINOSUS, sartorius, gracilis
knee ER BICEPS FEMORIS
ankle plantar flexion GASTROCS, SOLEUS, plantaris, tibialis posterior, flexor hallucis posterior, flexor digitorium longus
ankle dorsi flexion TIBIALIS ANTERIOR, extensor digitorum longus, extensor hallucis longus, peroneus tertius
foot (intertarsal) inversion (supination) TIBIALIS ANTERIOR, TIBIALIS POSTERIOR
foot (intertarsal) eversion (pronation) PERONEUS LONGUS, PERONEUS BREVIS, peroneus tertius
foot (intertarsal) plantarflexion PERONEUS LONGUS, TIBIALIS POSTERIOR, ABDUCTOR HALLUCIS, ABDUCTOR DIGITI MINIMI, FLEXOR DIGITORUM BREVIS, peroneus brevis
toes (metatarsophalangeal) flexion FLEXOR DIGITORUM BREVIS, LUMBRICALES, INTEROSSEI, FLEXOR HALLUCIS BREVIS, FLEXOR DIGITORUM BREVIS, FLEXOR HALLUCIS LONGUS, flexor digiti minimi brevis, flexor digitorum longus, quadratus plantae
toes (metatarsophalangeal) extension EXTENSOR HALLUCIS LONGUS, EXTENSOR DIGITORUM, EXTENSOR DIGITORUM BREVIS
toes (metatarsophalangeal) abduction ABDUCTOR HALLUCIS, ABDUCTOR DIGITI MINIMI, DORSAL INTEROSSEI
toes (metatarsophalangeal) adduction ADDUCTOR HALLUCIS, PLANTAR INTEROSSEI
toes (interphalangeal) flexion FLEXOR HALLUCIS LONGUS, FLEXOR DIGITORUM LONGUS, FLEXOR DIGITORUM BREVIS, quadratus plantae
toes (interphalangeal) extension EXTENSOR HALLUCIS LONGUS, EXTENSOR DIGITORUM LONGUS, EXTENSOR DIGITORUM BREVIS
Created by: wrenlette