Tuesday 29 May 2012

STRUCTURE OF SKIN-RABBIT

The skin of rabbit is also built of two main parts -an outer epidermis and an inner dermis.
EPIDERMIS-It is the outer thin stratified epithelium developed from the embryonic ectoderm.The epidermis consist of malpighian layer and the superficial cornified layer.
(a)MALPIGHIAN LAYER-The malpighian layer,or stratum malpighii is divided into (1)SRRATUM GERMINATIVUM-The germinal layer is the innermost layer in contact with the basement membrane secreatedby the underlying dermis.Its cells are columnar,arranged in a single row one cell thick,and continually divide mitotically adding new cells to the epidermis
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STRATUM SPINOSUM-Its lies above the germinal layer and is also called the transitional layer. It is several layer thick and made of polyhedral cells.these cells are gradually pushed outwards,they become flattened and keratinized due to deposition of a horny scleroprotein known as keratin.
STRARUM GRANULOSUM-The cells in the upper part of stratum spinosum form the granular layer containing keratohyalin granules. It is developed in parts of the body having thick epidermis such nas the palms and the soles.
STRATUM LUCIDUM-Above granular layer in palms ther is non-stainable layer of shiny and refracitle cells.

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