Facial muscles 2 - origin and insertion face PDF

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Summary

origin and insertion face...

Description

The dilator group of muscles around the mouth Zygomaticus major (zygoma = yoke)

Lateral aspect of zygomatic bone

Skin of angle of mouth

Zygomaticus minor

Lateral aspect of zygomatic bone

Lateral upper lip

Risorius (risor = laughter)

Fascia of lateral cheek

Skin of angle of mouth

Buccal branch of facial nerve CN VII

Levator anguli oris (= lift angle of mouth)

Maxilla below infraorbital foramen

Angle of mouth

Buccal branch of facial nerve CN VII

Depressor anguli oris (depress angle of mouth)

Anterolateral aspect of mandible

Angle of mouth

Buccal branch of facial nerve CN VII

Shares actions with risorius

Action(s): Pulls the angle of the mouth inferiorly Expression: grimacing and frowning

Levator labii superiorus (= elevates lip superiorly)

Infra-orbital margin of maxilla

Skin of upper lip

Buccal branch of facial nerve CN VII

Oblique fibers Shares action with zygomaticus minor

Action(s): Elevates and everts upper lip Expression: anger or disgust (when contracting with depressor labii inferioris)

Depressor labii inferioris

Platysma Anterolateral part of mandible

Skin of lower lip

Marginal branch of facial nerve CN VII

Oblique fibers

Action(s): Depresses, retracts and everts lower lip Expression: pouting, sadness

(depresses lip inferiorly)

Zygomatic branch of the facial nerve CN VII

More lateral than minor

Action(s): Elevates and everts the upper lip Draws the angle of the mouth laterally Expression: Bilaterally = smile (happiness) Unilaterally = sneer (disdain)

More medial than major Shares action with levator labii superiorus as both insert into upper lip Horizontal muscle Shares action with depressor anguli oris

Action(s): Pulls the corner of the mouth laterally. Depresses corner of mouth. Expression: grimacing, laughing

Action(s): Elevation of angle of mouth Expression: grinning

Mentalis (ment = chin)

Anterior surface of mandible

Skin of chin

Marginal branch of facial nerve CN VII

Action(s): Elevation and protrusion of the lower lip Expression: pouting...