File-058 - BIO 183 File-058 McCague SPECIAL SENSES EAR HISTOLOGY Inner Ear Histology Cochlear nerve Modiolus Bony wall of the inner ear Spiral

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McCague File-058 SPECIAL SENSES EAR HISTOLOGY Inner Ear Histology Cochlear nerve Modiolus Bony wall of the inner ear Spiral canal (scala vestibula, scala tympani) Cochlear duct Tectorial membrane Outer hair cells Inner hair cells Spiral ligament Vestibular membrane or Reissner’s membrane Phalangeal cells Basilar membrane Pillar cells Limbus Border cells Inner tunnel Neul’s space External spiral sulcus Hansen’s cells THE EAR The “organ of hearing” is really a compound organ with different functions. It is receptive to sound as well as the effects of gravity and head movement. These trigger sensations are called static and dynamic equilibrium. The external ear shows 3 subordinate divisions. The auricle is a shallow appendage situated on the lateral surface of the head. The external auditory meatus is a short tube, leading inward to the eardrum. The thin skinned vibratory tympanic membrane closes the deep end of the canal. The middle ear is the main part of the tympanic cavity which connects to the nasopharynx by way of the auditory tube . In the opposite direction it leads to the mastoid antrum . The latter communicates with many irrigular spaces called the mastoid air cells . A chain of 3 bones (ossicles) crosses the tympanic cavity. The inner ear is a receptive apparatus also contained within bone. Because it has an extremely irregular shape it is called a labyrinth are small sacs contained within the bony vestibule. 3 semicircular ducts are surrounded by bony
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This note was uploaded on 06/13/2011 for the course BIO 119 taught by Professor Stevendroho during the Spring '11 term at Moraine Valley Community College.

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File-058 - BIO 183 File-058 McCague SPECIAL SENSES EAR HISTOLOGY Inner Ear Histology Cochlear nerve Modiolus Bony wall of the inner ear Spiral

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