Heterochromatic regions, silenced genes, and gene-sparse regions of chromosomes are typically localized to the nuclear periphery.

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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

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#Unit 7. System Physiology – Animal

The basilar membrane is relatively permeable to perilymph in the scala tympani, and tunnel of the organ of Corti and the bases of the hair cells are bathed in perilymph