Muscles of Facial Expression and Mastication

Muscles of Facial Expression and Mastication - Mandible...

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Muscles of Facial Expression and Mastication 1. Facial Expression: innervated by facial nerve (CN VII) Muscle Origin Insertion Function Frontalis Epicranial aponeruosis ( galea aponeruotica ) Skin of the eyebrows Draws eyebrows upwards Wrinkles forehead Orbicularis oculi Bones surrounding eye (lacrimal, zygomatic, maxilla) Upper and lower eyelids, skin of orbit Encircles eye, lowers eyelid, closes eye, compresses lacrimal sac Zygomaticus major Front of zygomatic bone Corner of mouth Draws the corner of the mouth upwards (smiling) Buccinator Lateral surfaces of the alveolar processes of the maxilla and mandible Corner of the mouth Increases rigidity of cheek Orbicularis oris Modiolus (see text P. 301) Lips Encircles mouth, closes lips and compresses lips against teeth, purses lips (kissing) Platysma Facia of clavicle Facia below mouth Draws corners of mouth downward Depressor anguli oris Inferior margin of mandibular body Modiolus Draws mouth downward and laterally (sad) Mentalis
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Unformatted text preview: Mandible (near incisors) Skin of chin at mental protuberance Elevates and protrudes lower lip (pouting) 2. Muscles of Mastication and related muscles: innervated by mandibular branch of the trigeminal nerve (CN V), except digastric which is innervated by facial n (CN VII) Muscle Origin Insertion Function Temporalis* temporal lines of parietal coronoid process of mandible elevation and retraction of mandible Masseter* zygomatic process angle of mandible elevation and protraction of mandible Lateral pterygoid* lateral side of lateral pterygoid plate neck of mandible depression and protraction of mandible, side-side Medial pterygoid* medial side of lateral pterygoid plate angle of mandible elevation, protraction of mandible, side-side Digastric, anterior anterior and internal mandible tendon to body of hyoid depress mandible Digastric, posterior mastoid process tendon to body of hyoid depress mandible...
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This note was uploaded on 04/27/2009 for the course BIOL 240 taught by Professor Mcleod during the Spring '08 term at Kansas.

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Muscles of Facial Expression and Mastication - Mandible...

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