Muscle actions Flashcards

1
Q

buccinator

A

draws corners of mouth laterally; compresses cheek (as in sucking and whistling), holds food between teeth while chewing, well developed in nursing infants

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2
Q

Corrugator Supercilii

A

draws eyebrows together and inferiorly; wrinkles skin of forehead vertically (as in frowning)

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3
Q

Depressor Anguli oris

A

zygomaticus antagonist; draws corners of mouth downward and laterally

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4
Q

Depressor labii Inferioris

A

Draws lower lip inferiorly (pout)

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5
Q

Frontal Belly

A

with aponeurosis fixed, raises the eyebrows (as in surprise); wrinkles forehead skin horizontally

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6
Q

Genioglossus

A

primarily protrudes tongue, but can depress or act in concert with other extrinsic muscles to retract tongue

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7
Q

Hyoglossus

A

depresses tongue; draws its sides downward

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8
Q

Lateral Pterygoid

A

protrudes mandible (pulls it anteriorly); provides forward sliding and side to side grinding movements of the lower teeth

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9
Q

Levator Labii Superioris

A

opens lips; raises and furrows the upper lip

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10
Q

Masseter

A

prime mover of jaw closure; elevates mandible

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11
Q

Medial Pterygoid

A

synergist of temporalis and masseter muscles in elevation of the mandible; acts with the lateral pterygoid muscle to protrude mandible and to promote side to side (grinning) movements

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12
Q

Mentalis

A

protrudes lower lip; wrinkles chin

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13
Q

Occipital Belly

A

fixes aponeurosis and pulls scalp posteriorly

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14
Q

Orbicularis Oculi

A

protects eyes from intense light and injury; various parts can be activated individually; produces blinking, squinting, and draws eyebrows inferiorly

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15
Q

Orbicularis Oris

A

Closes lips; purses and protrudes lips; kissing and whistling muscle

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16
Q

Platysma

A

helps decrease mandible; pulls lower lip back and down, i.e., produces downward sag of mouth; tenses skin of neck (ex; during shaving)

17
Q

Risorius

A

draws corner of lip laterally; tenses lips; synergist of zygomaticus

18
Q

Styloglossus

A

retracts and elevates tongue

19
Q

Temporalis

A

closes jaw; elevates and retracts mandible, synergist of pterygoids in side- to- side movements, maintains position of the mandible at rest

20
Q

Zygomaticus

A

raises lateral corners of mouth upward (smiling muscle)