ch. 11 muscles and actions

43 terms by moanderson 

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on lab sheet

frontalis

draws scalp forward

occiptalis

draws scalp backwards

orbicularis oculi

closes eyes

orbicularis oris

closes lips

platysma

draws outer part of lower lilp down

masseter

elevates mandible

temporalis

elevates and retracts mandible

sternocleidomastoid

contracts/ flexes cervical part of vertebral column

digastric

elevates hyoid and base of tongue during swallowing

sternohyoid

depresses larynx, may flex skull

rectus abdominus

flexes vertebral column

external oblique

compresses abdomen

internal oblique

compresses abdomen

transverse abdominis

compresses abdomen

diaphragm

forms floor of thoracic cavity

external/ internal intercostals

draws adjacent ribs together

rectus abdominis

flexes vertebral column at lumbar/ compress abdomen

gluteus maximus

extends rotates thigh lterally

gluteus medius

adducts thigh medially

tensor faciae latae

flexes abducts

sartorius

...

rectus femoris

extends knee/ flexes thigh at hip

vastus lateralis

extends stablizer

vastus medialis

extends knee inferior fibers stablize patella

vastus intermedialis

extneds knee

graicilis

adducts thigh, helps in walking

gastrocnemius

flexes knee

soleus

planta flexion

hamstrings

extends knee/flexes thigh

biceps femoris

extneds thigh flexes knee

semitendinosus

extned thigh at hip flexes knee

semimembranosus

extends thigh and flexes knee

tibialis anterior

prime mover of dorsal flexion/ inverts foot

tibialis posterior

planta flexion, inverts foot

pectoralis major

flexes, adducts rotates arm

deltoid

priime mover of abduction

latissimus dorsi

extends/ adducts/ rotates arm

teres major

extends/ draws arm downwrd

teres minor

rotates arm laterally

bicep brachii

flexes/supinates forearm

brachialis

flexes forearm

brachiradialis

flexes forearm

tricepts brachii

extends forearm

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