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Muscles and Actions
Muscles and Actions
76
Anatomy
10/13/2008
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Term
erector spinae [A]
 Definition
extends spine
Term
external intercostals [A]
 Definition
elevate ribcage (relaxed inspiration)
Term
internal intercostals [A]
 Definition
depress ribcage (forced expiration)
Term
diaphragm [A]
 Definition
prime mover of inspiration (relaxed inspiration)
Term
rectus abdominus [A]
 Definition
flexes vertebral column
Term
external oblique [A]
 Definition
flexes vertebral column
Term
internal oblique [A]
 Definition
flexes vertebral column
Term
transverse abdominus [A]
 Definition
compresses abdominal contents
Term
pectoralis minor [A]
 Definition
draws scapula forward and downward
Term
serratus anterior [A]
 Definition
rotates scapula
Term
pectoralis major [A]
 Definition
flexes arm
Term
latissimus dorsi [A]
 Definition
adducts at shoulder
Term
deltoid [A]
 Definition
abduction of arm
Term
subscapularis [A]
 Definition
medial rotation of humerus
Term
supraspinatus [A]
 Definition
abduction of arm
Term
infraspinatus [A]
 Definition
lateral rotation of humerus
Term
teres minor [A]
 Definition
lateral rotation of humerus
Term
teres major [A]
 Definition
adduction of arm
Term
trapezius [A]
 Definition
elevates scapula
Term
coracobrachialis [A]
 Definition
arm flexor and adduction
Term
levator scapulus [A]
 Definition
adducts scapula
Term
rhomboids [A]
 Definition
stabilizes scapula
Term
triceps brachii [A]
 Definition
extends forearm
Term
biceps brachii [A]
 Definition
flexes forearm
Term
brachialis [A]
 Definition
flexes forearm
Term
brachioradialis [A]
 Definition
flexes forearm
Term
pronator teres [A]
 Definition
pronates forearm
Term
flexor carpi ulnaris [A]
 Definition
flexes wrist
Term
flexor carpi radialis [A]
 Definition
flexes wrist
Term
palmaris longus [A]
 Definition
tenses skin of palm
Term
flexor digitorum [A]
 Definition
flexes wrist
Term
extensor carpi radialis longus [A]
 Definition
extends wrist
Term
extensor digitorum [A]
 Definition
finger extension
Term
extensor carpi ulnaris [A]
 Definition
extends wrist
Term
occipitofrontalis [A]
 Definition
raises the eyebrows
Term
buccinator [A]
 Definition
compresses cheeks
Term
depressor anguli oris [A]
 Definition
depresses the angle of the mouth
Term
levator anguli oris [A]
 Definition
elevates the angle of mouth
Term
mentalis [A]
 Definition
wrinkles chin
Term
orbicularis oris [A]
 Definition
purses the lips
Term
zygomaticus [A]
 Definition
elevates the angle of the mouth superiorly and laterally
Term
orbicularis oculi [A]
 Definition
CLOSES the eye
Term
temporalis [A]
 Definition
closes jaw
Term
masseter [A]
 Definition
prime mover of jaw closure
Term
medial pterygoid [A]
 Definition
protracts mandible
Term
lateral pterygoid [A]
 Definition
protracts mandible
Term
digastric [A]
 Definition
depresses mandible
Term
sternocleidomastoid [A]
 Definition
flexes and laterally rotates the head
Term
scalene [A]
 Definition
elevate first two ribs
Term
splenius [A]
 Definition
extend or hyperextend head
Term
psoas major (iliopsoas) [A]
 Definition
thigh flexion
Term
iliacus (iliopsoas) [A]
 Definition
thigh flexion
Term
sartorius [A]
 Definition
thigh flexion
Term
gluteus maximus [A]
 Definition
thigh extension
Term
gluteus medius [A]
 Definition
abducts thigh
Term
pectineus [A]
 Definition
adducts thigh
Term
adductor longus [A]
 Definition
adducts thigh
Term
adductor magnus [A]
 Definition
adducts thigh
Term
gracilis [A]
 Definition
adducts thigh
Term
rectus femoris [A]
 Definition
extends knee
Term
vastus lateralis [A]
 Definition
extends knee
Term
vastus intermedius [A]
 Definition
extends knee
Term
vastus medialis [A]
 Definition
extends knee
Term
tensor fasciae latae [A]
 Definition
steadies trunk on thigh
Term
biceps femoris [A]
 Definition
flexes knee
Term
semitendinosus [A]
 Definition
flexes knee
Term
semimembranosus [A]
 Definition
flexes knee
Term
tibialis anterior [A]
 Definition
dorsiflexes foot
Term
extensor digitorum longus [A]
 Definition
toe extension
Term
extensor hallucis longus [A]
 Definition
extends great toe
Term
fibularis longus [A]
 Definition
everts foot
Term
gastrocnemius [A]
 Definition
plantar flexes foot
Term
soleus [A]
 Definition
plantar flexes foot
Term
flexor digitorum longus [A]
 Definition
plantar flexes foot
Term
flexor hallucis longus [A]
 Definition
plantar flexes foot
Term
tibialis posterior [A]
 Definition
foot inversion