VESTIBULOCOCHLEAR APPARATUS
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VESTIBULOCOCHLEAR APPARATUS
Dr Iram Tassaduq
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INTRODUCTION Ear is related to equilibrium and hearing Consist of 3 parts external ear for sound wave
reception middle ear for transmission of
bones from air to bone inner ear for transduction of
vibrations to nerve impulses
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EXTERNAL EAR Pinna having elastic
cartilage External auditory
meatus having coiled tubular glands
Tympanic membrane covered externally by epidermis and internally
by simple cuboidal epithelium
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MIDDLE EAR Lined by simple
squamous epithelium
Thin lamina propria Transformation of
simple squamous to pseudostratified ciliated columnar epithelium near auditory tube
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INTERNAL EAR Has two
componentsBony labyrinth consist
of cochlea,vestibule and semicircular canals
Membranous labyrinth consist of saccule and utricle filled with endolymph
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MEMBRANOUS LABYRINTH Composed of thin
sheet of connective tissue lined with simple squamous epithelium
Have maculae ( regions of differentiated neuroepithelial cells)
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STRUCTURE OF MACULA 2 types of receptor
(hair cells)
Supporting cells are columnar in shape with microvilli
Otolith a gelatinous glycoprotien covering this neuro epithelium
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ENDOLYMPHATIC DUCT AND SAC
Endolymphatic duct is lined by simple squamous epithelium initially
Simple columnar epithelium near sac
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COCHLEAR DUCT Divided into 3
spaces• Scala vestibuli• Scala media• Scala tympani
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ORGAN OF CORTI
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