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Integumentary System
Chapter 3
Term | Definition |
---|---|
Epidermis | *most superficial layer of skin *stratified squamous epithelium *avascular |
Dermis | middle layer of skin |
hypodermis/subcutaneous layer | deepest layer of skin |
Basal lamina | base of the epithelium |
Keratinocytes | most abundant cell in the epidermis, produce keratin, |
melanocytes | produce pigment |
Merkel cells | nerve endings |
Langerhans Cells | immune system cells |
Stratum Germinativum (basale) | epidermis layer: bottom layer, "basale" merkel & basal cells, cells are dividing, vit D is produced |
Stratum Spinosum | epidermis layer: 1st layer from bottom, langerhans cells, 8-10 layers of keratinocytes, cell are dividing, via D is produced "spiny" |
stratum granulosum | epidermis layer: 2nd from bottom, 3-5 layers of keratinocytes (which flatten) no cell division "grainy" |
stratum lucidum | epidermis layer: "clear" ONLY ON HANDS AND FEET |
stratum corneum | epidermis layer: top layer, exposed surface , 15-30 layer of keratinocytes, and keratinization |
Papillary layer | more superficial layer of the Dermis |
reticular layer | deeper layer of the dermis |
hypodermis | subcutaneous layer of the integument, fascial layer that attaches to the skin to the underlying structures |
apocrine sweat glands | armpits, nipple & groin area, secrete into hair follicles |
merocrine (eccrine) sweat glands | most numerous sweat glands |
nail body | visible section of the nail |
nail bed | area of the epidermis that is covered by the nail body |
hyponychium | area at the tip of the finger with thickened stratum corneum |
nail root | nail is produced here |
eponychium | cuticle |
lunula | half moon on nail, lighter because blood vessels are obscured |