click below
click below
Normal Size Small Size show me how
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 |