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Integumentary System

Review Integumentary System Test

TermDefinition
Integumentary system consists of skin and its derivatives (sweat and oil glands, hairs, and nails)
Skin layers Epidermis, dermis, hypodermis
Epidermis the most superficial layer of the skin, made up of avascular, epithelial tissue (keratinized stratified squamous), contains keratinocytes, melanocytes, merkel's cells, and langerhan's
Dermis made up of vascular, connective tissue
Hypodermis (superficial fascia) made up of a loose connective tissue (areolar, adipose) anchors the skin to the underlying organs yet allows for free movement; acts as a shock absorber and insulator
Epidermal Layers stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corncum, stratum germinativum
stratum basale single row of mostly columnar keratinocytes; contains Merkel's cells (touch) and melanocytes; the number of melanoctyes doesn't vary, but instead the amount of pigment differs
stratum spinosum contains keratinocytes and Langerhans' cells
stratum granulosum 2-3 layers of cells; keratinization begins here
stratum lucidum contains a few rows of keratinocytes; found only in thick skin
stratum corncum 20-30 cell layers thick; makes up 3/4 of the epidermis
stratum germinativum area where epidermal cells are made made up of stratum basale and stratum spinosum
Dermis contains all three types of fibers (collagen, elastin, and reticular) contains hair, follicles, oil and sweat glands
Dermal layers papillary layer and reticular layer
papillary layer made up of those connective tissue, very vascular, has extensions called dermal papillae that protrude into the epidermis, these projections are arranged in a series of looped and whorled ridges, they serve to increase friction and enhance gripping
Reticular layer
Created by: mchuan