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Facial expression m.
Muscles of Facial Expression- Ch 30
| Term | Definition |
|---|---|
| Anterior Auricular m. | O: scalp in front of ear I: Anterior ear F: pulls ear forward |
| Superior Auricular m. | O: scalp above ear I: upper ear F: raises ear |
| Posterior Auricular m. | *most developed ear muscle in humans O: superior nuchal line I: posterior ear F: pulls ear back |
| Occipitofrontalis | *also known as epicranius O: connective tissue of scalp F: moves scalp forward-squint & backward-surprise |
| Platysma | *broad flat sheet O: skin below clavicle I: inferior border of mandible F: pulls corner of mouth down - grimace |
| Orbicularis Oculi | *orbital part- encircles eye *palpebral part- eyelid O: medial & lateral edges of eye I: medial & lateral corners of eye F: close eyelids |
| Levator palpabrae superioris | Muscle of the orbit O: back of eye I: upper eyelid F: raises eyelid N: III cranial nerve- occulomotor nerve |
| Corrugator | O: bridge of nose I: lateral eyebrow F: pulls eyebrow medially & down |
| Procerus | O: bridge of nose I: medial eyebrow F: pulls eyebrow down medially |
| Dilator Naris | O: base of nose I: lateral of nose F: pull nostrils down to flare |
| Compressor Naris | O: nasal septum I: lateral of nose F: compress nostrils |
| Orbicularis Oris | O: anterior nasal spine I: skin of lip F: closes & compresses lips |
| Levator Labii Superioris | O: lower orbit I: orbicularis oris F: elevates upper lip |
| Zygomaticus Minor | O: zygomatic bone I: orbicularis oris F: raises upper lip, but not a great influence |
| Zygomaticus Major | O: zygomatic bone I: orbicularis oris/corner of mouth F: elevates corners of mouth- smile |
| Levator Anguli Oris | O: infraorbital foramen of maxilla I:orbicularis oris/corners of mouth F: pulls angle of mouth up toward midline |
| Depressor Labii Inferioris | O: inferior border of mandible I: orbicularis oris/middle of lower lip F: pulls lower lip down- pout |
| Depressor Anguli Oris | O: inferior border of mandible I: orbicularis oris/corners of mouth F: pulls corners of mouth down |
| Mentalis | O: anterior surface of mandible I: skin of chin F: pulls skin of chin up |
| Buccinator | *most important muscle of the mouth *accessory muscle of mastication O:pterygomandibular raphe & buccal alveolar bone I: orbicularis oris/corners of mouth F: pulls corner of mouth back & compresses cheeks, pushes food back onto occlusal surfaces |
| Risorius | O: angle of mandible I: skin at corner of mouth F: aids in smiling-poorly developed |
| All muscles of facial expression innervated by | Cranial nerve VII Facial |
Created by:
smllfry1401
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