The histone-fold domain is composed of three a-helical regions separated by two short unstructured loops.

 

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#Id: 5656

#Unit 7. System Physiology – Animal

The labyrinth has three components: 

Cochlea (containing receptors for hearing)

Semicircular canals (containing receptors that respond to head rotation)

Otolith organs (containing receptors that respond to gravity and head tilt)

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#Unit 7. System Physiology – Animal

The bony labyrinth is a series of channels and filled with a fluid called perilymph, which has a relatively low concentration of K+, similar to that of plasma or the cerebral spinal fluid

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#Unit 7. System Physiology – Animal

The membranous labyrinth more or less duplicates the shape of the bony channels and is filled with a K+-rich fluid called endolymph

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#Unit 7. System Physiology – Animal

Cochlea has three chambers: 

scala vestibuli

scala media

scala tympani

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#Unit 7. System Physiology – Animal

The upper scala vestibuli and the lower scala tympani contain perilymph and communicate with each other at the apex of the cochlea through a small opening called the helicotrema

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#Unit 7. System Physiology – Animal

The scala media, is continuous with the membranous labyrinth and does not communicate with the other two scalae