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The Muscles & Their Action

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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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  


   


 
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