CSD-4364 Lecture Notes - Lecture 2: Membranous Labyrinth, Endolymph, Efferent Nerve Fiber

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

Document Summary

Audiology: anatomy of the inner ear, cochlea, anterior, contains sensory organs for hearing, semicircular canals, posterior, contains sensory organs for balance, vestibule, connects the cochlea and semicircular canals, contains additional sensory organs for balance, bony and membranous labyrinth. Inner ear structures are housed within the bony labyrinth: a series of interconnected paces in the temporal bone. Inside bony labyrinth is a membranous labyrinth separates the spaces into the two separate fluid compartments. Lateral bending opens specialized pores in the steriocilia and activates the hair cells. Ihcs stimulate auditory nerve fibers: summary: inhibitory phase of stimulation, tympanic membrane moves inward, stapes footplate moves inward, basilar membrane moves downward, hair cell stereocilia bend medially, ohcs elongate. 20 fibers connect to each ihcs: carry info about sound stimulus, type ii outer radial fibers, 5% of afferent fibers, many to many connections with ohcs, each type ii fiber connects to. 10-20 ohcs: each ohc is contacted by about.