Stratum Basale
- composed of a single row of cuboidal or columnar keratinocytes
- continuously undergoing cell division
Stratum Spinosum "thorn-like"
- 8 to 10 layers of many-sided keratinocytes fitting closely together
- Keratinocytes of the straum spinosum shrink and pull apart when prepared for microscopic examination, so that they appear to be covered with thornlike spines
Stratum Granulosum "little grains"
- consists of three to five layers of
flattened keratinocytes
- the stratum granulosum marks the transition between the deeper, metabolically active strata and the dead cells of the more superficial strata.
Stratum Lucidum "clear"
- found only in thick skin
- contain large amounts of keratin and thickened plasma membrane
Stratum Corneum "horns"
- cells are extremely thin, flat, plasma-membrane enclosed packages of keratin that no longer contain a nucleus or any internal organelles
- made up of dead,
keratinized cells
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