Movement of the head cause flow of endolymph and deflection of cupola of crista ampularis As a result of this hairs get bend As a result impulses are generated in hair cells and are passed on through vestibular branch of VIII cranial nerve to thae brain Similarly flow of endolymph in otolith organ of utricle and saccule causes the movement of hairs of the hair cells This causes generation of action potential discharge which are passed on to the brain through vestibular branch of VIII cranial nerve In brief static equilibrium is the orientation of the body relative to the pull of gravity The macule of utricle and saccule are the sense organs of static equilibrium Dynamic equilibrium is the maintenance of body position in response to movement Crista ampullaris is the sense organ for the dynamic equilibrium
Fig otolith organ of utricle and saccule
Vestibular Disease ::
There are a variety of diseases of the inner ear which are characterised by vertigo servere dizziness tinnitus or ringing in the ears and deafness The vertigo is often so severe that there is nausea and vomiting blurred vision a tendency to fall in a certain direction and nystagmus Nystagmus is characterised by rapid involuntary movement of the eyeballs Electro nystagmography is a diagnostic test that is useful in identifying vestibular diseases Electrodes are placed on each side of the face to measure movement of the eye while they are closed
Otitis media ::
It is discharge of pus from middle ear with rupture of the drum
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