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16 Cards in this Set
- Front
- Back
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What is the primary action of the epicranius muscle? Location?
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Elevate the eyebrows. Covers the forehead, top of skull, and back of head. **has two bellies joined by aponeurosis**
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What is the primary action of the orbicularis oculi?
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Close the eyelid
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What is the primary action of the orbicularis oris?
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Close or purse the lips
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What is the primary action of the Masseter? Origination? Insertion?
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Elevate the mandible.
O-zygomatic arch and maxilla I-angle and ramus of the mandible |
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What is the primary action of the temporalis? Origination? Insertion?
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Elevate the mandible.
O-temporal bone I-coronoid process of the mandible |
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What is the primary action of the platysma?
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Depress the mandible.
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Which muscles are synergists?
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Masseter and temporalis.
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Which muscles are antagonists?
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Temporalis and masseter are antagonists to the platysma.
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What is the action of the superior rectus?
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Rotate the eyeball superiorly.
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What is the action of the inferior rectus?
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Rotate the ball inferiorly.
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What is the action of the medial rectus?
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Rotate the eyeball medially. **Towards nose**
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What is the action of the lateral rectus?
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Rotate the eyeball laterally. **located by gland**
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What is the primary action of the sternocleidomastoid? Origination?
Insertion? |
One contracts=head rotates
Both contract=head flexes **chin to chest** Origination-manubrium and clavicle Insertion-mastoid process |
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What is the primary action of the splenis capitis?
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Both contract=head extends
One contracts=rotation |
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When do the splenis capitis and sternocleidomastoid work as syndergists?
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Rotation
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When do the splenis capitis and sternocleidomastoid work as antagonists?
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extension of the splenis capitis and flexation of the sternocleidomastoid.
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