Name the tissue types composing the epidermis and dermis; major layers of each & describe functions of each layer
- Epidermis: kerantized stratified squamous epithelium. Layers:
- * Stratum basale, deepest epidermal layer, is the site of mitosis
- * Stratum spinosum, serval cll layers thick and contains keratincytes, melanin granules, and the highest concentration of epidermal dendritic cells.
- * Stratum granulosum, contains keratinocytes that are undergoing physical changes, turning them into the tough outer cells of the epidermis
- * Stratum lucidum, found only in thick skin and is composed of dead keratinocytes
- * Stratum corneum, outermost protective layer of the epidermis composed of a thick layer of dead keratinocytes
Dermis: has 2 layers: the thin, superficil papillary layer , highly vascularized areolar connective tissue containing a woven mat of collegen and elastin fibers. And the reticular layer, 80% of the thickness of dermis, dense irregular connective tissue.