muscle functions Flashcards by davis spiess

Epicranius Frontalis

raises eyebrows

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obicularis oculi

closes eyes

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zygomaticus

smiling muscle

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orbicularis oris

closes lips, kissing muscle

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masseter

closes jaws

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buccinator

compresses cheek (as in whistling)

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sternocleidomastoid

flexation of neck forward
rotates head toward opposite shoulder

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pectoralis major

arm flexion adducts

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deltoid

arm abduction

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rectus abdominis

flexes and rotates vertebral column

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biceps brachii

flexes elbow and supinates forearm

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pronator teres

pronates forearm

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flexor carpi radialis

powerful wrist flexor

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trapezius

extends neck
raises, rotates, and retracts scapula

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erector spinae

all act to extend and bend the vertebral column

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triceps brachii

powerful forearm extensor, antagonist of biceps brachii

extensor carpi radialis longus

extends and abducts wrist

extensor digitorium

prime mover of finger extension
extends wrist
can flare (adduct) fingers

sartorius

flexes, abducts, and laterally rotates thigh, flexes knee

rectus femoris

extends knee and flexes thigh at hip

vastus lateralis

extends and stablizes knee

vastus medialis

extends knee

vastus intermedius

extends knee

tibialis anterior

prime mover of dorsiflexion; inverts foot

exterior digitorium longus

prime mover of toe extension

gluteus maximus

powerful hip extensor (used most when climbing stairs)

biceps femorus

extends thigh laterally raises knee

semitendinosus

extends thigh flexes knee medially rotates leg

semimembranosus

extends thigh flexes knee medially rotates leg

gastrocnemius

plantar flexes foot crosses knee joint flexes knee when foot is dorsiflexed

soleus

plantar flexes foot