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A&P1 - Muscles
The Muscles & Their Action
| Term | Definition |
|---|---|
| abductor pollis longus | abducts at point of thumb and wrist |
| adductor longus | adduction, flexion and medial rotation at hip |
| adductor magnus | adduction at hip |
| biceps brachii | flexion at elbow and shoulder |
| biceps femoris | flexion at knee |
| brachialis | flexion at elbow |
| briachioradialis | flexion at elbow |
| buccinator | compresses cheeks |
| coracobrachialis | adduction and flexion at shoulder |
| deltoid | whole muscle; abduction at shoulder |
| depressor labii inferioris | elevates upper lip |
| erector sipnae | extends neck |
| extensor carpi radialis breris | extension and abduction at wrist |
| extensor carpi radialis longus | extension and abduction at wrist |
| extensor carpi ulnaris | extension and adduction at wrist |
| extensor digitorum | extension of fingers at joints 2-5 |
| extensor digitorum longus | extension of joints of toes 2-5 |
| extensor hallucis longus | extension at joints of great toe |
| extensor pollicis brevis | extension at joints of thumb; abduction at wrist |
| external abdominal oblique | compresses abdomen, depresses ribs and flexes or binds spine |
| external intercostalis | elevates ribs |
| fibularis brevis | extension of foot and extension at ankle |
| fibularis longus | eversion of foot and extension at ankle; supports longitudinal arch |
| flexor carpi radialis | flexion and abduction at wrist |
| flexor carpi ulnaris | flexion and abduction at wrist |
| flexor digitorum longus | flexion at joints of toes 2-5 |
| flexor digitorum profundis | flexion at distal interphalangeal joints and to a lesser degree, promixal interphalangeal joints and wrist |
| flexor digitorum superficialis | flexion at proximal interphalangeal, metacarpophalangeal and wrist joints |
| flexor hallucis longus | flexion at joints of great toe |
| flexor pollicus longus | extension at joints of thumb, abduction at wrist |
| gastrochemius | extension at ankle, inversion of foot, and flexion at knee |
| gluteus maximus | extension and lateral rotation at hip |
| gluteus medius | abduction and medial rotation at hip |
| gracilis | flexion at knee, adduction and medial rotation at hip |
| iliopsoas | flexion at hip |
| infraspinatus | lateral rotation at shoulder |
| internal abdominal oblique | compresses abdomen, depresses ribs and flexes or bends spine |
| latissimus dorsi | extension, adduction, and medial rotation at shoulder |
| levator labii superioris | elevates upper lip |
| levator scapulae | elevates scapula |
| masseter | elevates mandible and closes the jaw |
| nasalis | compresses bridge, depresses tip of nose and elevates corners of nostrils |
| occipitofrontalis | raises eyebrows, wrinkles forehead and tenses/retracts scalp |
| orbicularis occuli | closes eye |
| orbicularis oris | compresses, purses lips |
| palmaris longus | flexion at wrist |
| pectoralis minor | depresses and protracts shoulder |
| pectoralis major | flexion, adduction, and medial rotation at shoulder |
| popliteus | medial rotation of tibia; flexion at knee |
| pronator teres | pronation |
| rectus abdominus | depresses ribs, flexes vertebral column, compresses abdomen |
| rectus femoris | extension at knee; flexion at hip |
| rhomboideus major | adducts scapula and performs downward rotation |
| rhomboideus minor | adducts scapula and performs downward rotation |
| rhisoris | draws corner of mouth to side |
| sartorius | flexion at knee, flexion and lateral rotation at hip |
| semitendinosus | flexion at knee; extension and medial rotation at hip |
| serratus anterior | protracts shoulder; rotates scapula |
| soleus | extension at ankle |
| sternocleidomastoid | together, they flex the neck; alone, one side |
| subscapularis | medial rotation at shoulder |
| supinator | supination |
| supraspinatus | abduction at the shoulder |
| temporalis | elevates mandible |
| tensor fasciae latae | flexion and medial rotation at shoulder |
| teres major | extension, adduction, and medial rotation at shoulder |
| teres minor | lateral rotation at shoulder |
| tibialis anterior | flexion at ankle; inversion of foot |
| trapezius | depends on active region and state of other muscles; may (1) elevate/retract/depress or rotate scapula upward (2) elevate clavicle or (3) extend neck |
| transversus abdominis | compresses abdomen |
| triceps brachii | extension at elbow |
| vastus intermedius | extension at knee |
| vastus lateralis | extension at knee |
| vastus medialis | extension at knee |
| zygomaticus major | retracts and elevates corner of mouth |
| zygomaticus minor | retracts and elevates upper lip |