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INTERNAL EAR

By Yolanda Greene,2014-11-25 10:46
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INTERNAL EAR

INTERNAL EAR

    Learning objective

    ; At the end of the lecture the student should be able to

    know:

    ; Details of internal ear.

    ; Parts of internal ear.

    ; Functions of internal ear.

    ; Details of organ of hearing and balance. ; Applied anatomy

Ear

    ; The ear is the organ of hearing and balance. It has three

    parts:

    ; External ear

    ; Middle ear

    ; Internal ear

    ; All these structures are in the petrous part of the temporal bone between the middle ear laterally and the internal acoustic meatus medially.

    Parts of internal ear

    ; Internal ear consists of:

    ; Bony labyrinth

    ; Vestibule,

    ; Three semicircular canals

    ; Cochlea

    ; Membranous labyrinth.

    ; Semicircular ducts

    ; Cochlear duct

    ; Two sacs (utricle and saccule). ; These bony cavities are lined with periosteum and contain a clear

    fluid the perilymph.

    ; The membranous

     spaces are filled with endolymph.