Anatomy and Cell Biology 3319 Lecture Notes - Lecture 19: Medial Pterygoid Muscle, Lateral Pterygoid Muscle, Facial Nerve

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: Michele Barbeau

Document Summary

Intro to the muscular system: muscles of the head (facial expression, mastication & tongue) Intro to the muscular system: muscle structure & terminology: more than 700 muscles in body, variety of shapes, sizes related to function, ex. Muscle attachments: primer move major action (agonist, antagonist muscle which opposes action, synergist muscle that assists action. Muscles of facial expression: occipitalis, frontalis, obicularis oculi, palpebral, orbital, corrugator supercilii, levator labi superioris, zygomaticus (major & minor, risorius, orbicularis oris, depressor labii inferioris, depressor angui oris, mentalis, buccinator, plastysma. One end of muscle attached to bone, other intermingles w other muscles or inserts to skin. Inserts to skin of chin: puckers skin of chin and protrudes lower lip (pouting) In soft part of cheek: keeps cheek close to teeth when blowing, chewing, etc, o maxilla and pterygomandibular raphe, a orbicularis oris. Platysma: tenses skin of inferior face & neck, frontalis, pulls scalp anteriorly, elevates eyebrows & wrinkles skin of forehead, occipitalis, retracts scalp posteriorly.