CDIS 4213 Lecture Notes - Lecture 15: Orbicularis Oris Muscle, Palatine Bone, Hard Palate
26 Oct 2016
School
Department
Course
Professor
Document Summary
Velum (soft palate) muscular, mobile, posterior: when you see the word (cid:494)velar(cid:495) it means, posterior projection uvula, palatine aponerurosis (thin tissue sheet) something related to the velum portion. Curves downward and backward to posterior border of hard palate and laterally to the pharyngeal walls. The lips consist of four layers: cutaneous (outer layer, muscular, glandular, mucous. Orbicularis oris (oris = oral: unpaired, oval ring of muscle fibers located in the lips and completely encircling the mouth slit. Quadratus labi inferiores (depressor labi inferior: paired, insertion: Quadratus labi superioris (labi superior: paired. Angular head: origin frontal process of maxilla. Infraorbital head: origin infraorbital margin: insertion of all 3 heads, orbicularis oris. Risorius: paired, flat, variable muscle lying lateral to the mouth, origin masseter, insertion blends with other muscles at the angle of the mouth, function pulls angle of mouth laterally, flat mouthed emoji!
