Physiology Of Hearing

The Academy for Medical Sciences & Technology

MR.SHARFI,ABD ELGADIR MD.OTOLARYNGOLOGYAss.Prof. O I U

•Physiologically the ear is divided into two-:•The conductive system-:

• EAC.TM,OSSICLES,ET,INNER EAR FLUID.•Perceiving system-:

• COCHLEAR ,8TH NERVE & CENTRAL SYSTEM.

PROBLEMS

•SMELL:

•HYPEROSMIA

•HYPOSMIA

•ANOSMIA

COMMON CAUSES

1-OLD AGE

2-COMMON DISEASES-SYSTEMIC

(DM &HYPERTENSION)AND LOCAL

3-RADIOTHERAPY

4 -DRUGS

HEARLING LOSS

•TWO TYPES

• 1-CONDUCTIVE

•2 -AND SNHL

CONDUCTIVE LOSS COMMON CAUSES?

• 1-CONGENITAL

• 2-ACQUIRED

•Causes of senserineural deafness-:

Viral (mumps)Bacterial (syphilis,labyrinithitis,)Presbyacusis.

OtotoxicityOtosclerosisSudden SNHL(idiopathic,surgery,H.trauma,

Noise induced HLcogenital

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