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OS 204 > Head & Neck Muscles - Action > Flashcards

Head & Neck Muscles - Action Flashcards

1
Q

What is the action of the frontalis muscle?

A

Elevates eyebrows and wrinkles forehead

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2
Q

What is the action of the occipitalis muscle?

A

Draws back scalp, raises eyebrows and wrinkles forehead

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3
Q

What is the action of the orbicularis oculi?

A

Palpebral: closes gently

Orbital: closes forcibly

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4
Q

What is the action of the zygomaticus major?

A

Draws the angle of the mouth backward and upward (laughing)

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5
Q

What is the action of the zygomaticus minor?

A

Deepens the nasolabial furrow/sulcus (contempt)

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6
Q

What is the action of the orbicularis oris?

A

Close and protrude lips; draws lips to teeth and alveolar arches (deep and oblique fibers)

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7
Q

What is the action of the depressor anguli oris?

A

Depressor of the angle of the mouth

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8
Q

What is the action of the buccinator?

A

Aids in chewing and blowing

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9
Q

What is the action of the platysma?

A

Draws lower lip and angle of mouth inferolaterally; partially opens mouth; wrinkles and draws skin over clavicle upward

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10
Q

What is the action of the levator palpebrae superioris?

A

Raises upper eyelid

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11
Q

What is the action of the superior rectus?

A

Rotates eyeball superiorly; rotates top of eyeball medially

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12
Q

What is the action of the inferior rectus?

A

Rotates the eyeball inferiorly; rotates the top of the eyeball laterally

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13
Q

What is the action of the medial rectus?

A

Rotates the eyeball medially

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14
Q

What is the action of the lateral rectus?

A

Rotates the eyeball laterally

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15
Q

What is the action of the superior oblique?

A

Rotates the eyeball medially (antagonizes the inferior rectus)

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16
Q

What is the action of the inferior oblique?

A

Rotates the eyeball laterally (antagonizes the superior rectus)

17
Q

What is the action of the temporalis?

A

Elevates and closes the jaw; retracts the jaw (posterior fibers)

18
Q

What is the action of the masseter?

A

Elevates and closes the jaw

19
Q

What is the action of the medial pterygoid?

A

Elevates the mandible (alone); protrudes the jaw (w/ lateral pterygoids); protrudes jaw toward opposite side (w/ 1 lateral pterygoid)

20
Q

What is the action of the lateral pterygoid muscle?

A

Draws condyle and articular disc of TMJ forward; lowers the jaw

21
Q
A

OS 204 (5 decks)

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