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Integumentary System

Chapter 3

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
Created by: michellerolfs