CSD-4364 Lecture Notes - Lecture 2: Petrous Part Of The Temporal Bone, Ear Canal, Coronal Plane

• School: App State
• Department: Communication Sciences and Disorders
• Course: CSD-4364
• Professor: Benjamin A.Russell

Document Summary

Audiology unit 2: anatomical orientation and directions, sagittal plane, divides right from left, midsagittal plane=midline, medial- toward midline. Lateral-away from midline: proximal- close to, distal- away from, dextral-right, sinistral- left, transverse plane, divides top from bottom, also called the horizontal plane, superior-up, rostral- toward the head, caudal-toward the tail. Lies posterior to ear canal: posterior portion of the bone, contains air cells, extends posteriorly from petrous portion, below and behind the squamous portion, tympanic, forms the inferior and anterior walls of the ear canal. Inferior to squamous and petrous portion and anterior to the mastoid portion. Innervated by the 7th cranial nerve (facial nerve) reflex: tensor tympani, about 4 times longer than stapedius muscle (25mm, contraction pulls malleus in the anterior, medial direction and stiffens the. 3. 5 centimeters long: tilts downward at about 45 degrees, almost horizontal in babies and young children.