ANP 1106 Chapter Notes - Chapter 15: Ear Canal, Bony Labyrinth, Semicircular Canals

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jackie Carnegie

Document Summary

Dr. jackie carnegie & dr. w staines: special sense: balance and hearing. Structure of the ear divided into external, middle, and inner ear; external and middle = hearing, inner equilibrium and hearing (complex) External ear collects sound waves and passes them inwards; consists of: Tympanic membrane (eardrum): thin ct covered in skin creating boundary btwn outer and inner ear: sound waves strike here and causes vibrations and transfers the sound energy to tiny bones of middle ear causing them to vibrate. Middle ear (tympanic cavity) small air-filled mucosa-lined cavity in the temporal bone. Example of cns control over sensory input: protects the auditory receptor cells; innervated by cranial nerves. Sound amplification overcomes the impedance matching problem. Vestibule central egg-shaped cavity of the bony labyrinth, suspended in perilymph are two sacs, saccule and utricle, they house equilibrium receptors maculae, and respond to gravity and report on changes in the position of the head.