CAM202 Lecture Notes - Lecture 1: Palatoglossal Arch, Mouth, Palatine Bone
20 Jul 2018
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Document Summary
Vestibule- between cheeks, lips and teeth, and gums. Oral cavity proper- deep to teeth: hard and soft palates separate oral cavity from nasal cavity. Hard palate is formed by the palatine process of the maxillary bone and the horizontal process of the palatine bone. Muscles around the mouth: orbicularis oris- sphincter of lips, causes lips to close and pucker. Innervated by the facial nerve (cn vii: there are several dilators of lips (levators/depressors of upper/lower lip and angle of mouth- corners of mouth, buccinator- deep muscle of cheek, helps in positioning bolus of food between molar teeth. It is also involved with making facial expressions and speech. Muscles of mastications: act across temperomandibular joint. By force vectors: elevation- masseter, temporalis, medial pterygoid, protrusion- pterygoids and masseter, retraction- temporalis, side-side grinding (abduct to opposite side)- pterygoids, depress- suprahyoid muscle and gravity. Permanent: for tearing and grinding food- mechanical digestion, four quadrants: Right/left, mandible/maxilla: eight teeth per quadrant:
