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Encyclopedia > Stratum granulosum

Stratum granulosum contains 3 to 5 rows of flattened cells whose cytoplasm contains small granules. The granules are proteins that are in the process of transforming into the waterproofing protein keratin. Granules is derived from the term granulosum. It is in this layer that you find glycolipids and a thickening of the membrane. Micrograph of stained α-keratin from mouse liver Keratins are fibrous structural proteins; tough and insoluble, they form the hard but nonmineralized structures found in reptiles, birds and mammals (vertebrates), and also the silk of insects and spiders (invertebrates). ...

Integumentary system
Skin - Sweat glands - Sebaceous glands - Hair - Nails
Epidermis (Stratum corneum, Stratum lucidum, Stratum granulosum, Stratum spinosum, Stratum germinativum/basale)
Dermis - Subcutis

  Results from FactBites:
Proceedings of the Oklahoma Academy of Science (2273 words)
Nearest the outer surface is a layer of cornified dead cells (stratum corneum); next is the granular cell layer (stratum granulosum); next the pentagonal cell layer (the stratum spinosum); and finally the undifferentiated cells stratum germinativum.
The lower density of gap junctions in the stratum granulosum raised the possibility that the cells in that layer did not exchange ions with the neighboring strata.
The zero-time gap junction density of the stratum granulosum found in this study (0.041 ± 0.013) is not significantly different from the gap junction density (0.04 ± 0.018) found previously (6).
  More results at FactBites »



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