Unit 4 - Head and Neck: Muscles of Facial Expression - Mouth and Neck (Ex. III) Flashcards Preview

Gross Anatomy '15 Ex. III > Unit 4 - Head and Neck: Muscles of Facial Expression - Mouth and Neck (Ex. III) > Flashcards

Flashcards in Unit 4 - Head and Neck: Muscles of Facial Expression - Mouth and Neck (Ex. III) Deck (2)
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1

orbicularis oris

O: deep surface of skin; S - maxilla (M plane); I - mandible
I: mucous membrane of lips
Inn: facial n. (CN VII) **branch**
A: acts as oral sphincter - compresses and protrudes lips (whistling, sucking, kissing); resists distension (when blowing)

2

buccinator

O: mandible; alveolar processes of maxilla and mandible; pterygoid mandibular raphe
I: angle of mouth; orbicularis oris
Inn: facial n. (CN VII) **branch**
A: presses cheek against molar teeth, working with tongue to keep food between occlusal surfaces and out of oral vestibule; expels air from oral cavity/resists distension when blowing; unilaterally draws mouth to one side

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