PHYSCI 107 Chapter Notes - Chapter 5: Stratum Granulosum, Stratum Spinosum, Stratum Corneum
13 Oct 2020
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Document Summary
Keratinocytes (ke-rat-i-n -s ts) are the body"s most abundant epithelial cells. They form several layers of cells and contain the protein keratin (discussed shortly). Thick skin, found on the palms of the hands and soles of the feet, contains five layers of cells. Only four layers make up thin skin, which covers the rest of the body. The words thin and thick refer to the relative thickness of the epidermis only, not to that of the integument as a whole. strata (singular stratum), in a section of thick skin. In order, from the basement membrane toward the free surface, they are the stratum basale, three intermediate layers (the stratum spinosum, the stratum granulosum, and the stratum lucidum), and the stratum corneum. The deepest epidermal layer is called the stratum basale (stra-tum buh-sal- y; basis, base), or stratum germinativum (stra-tum jer-mi-na-t -vum; stratum, layer + germinare, to start growing).
