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ASMT- A&P #3
Integument
Question | Answer |
---|---|
3 Layers of the skin | Epidermis, Dermis, Hypodermis/telasubcutania |
Epidermis | Epithelial tissue, outermost layer of skin |
Dermis | Dense irregular C.T., vascular, feeds epidermis, gives strength & structural security, middle layer of skin |
Hypodermis/telasubcutania | Loose C.T. layer, adipose tissue layer, deepest layer of skin |
Layers of the Epidermis | Stratum corneum, stratum granulosum, stratum spinosum, stratum basale |
Stratum Basale | keratinocytes & melanocytes |
Stratum Spinosum | many mature keratinocytes that are flattened |
Stratum Granulosum | keratinocytes flattened and structurally changed, waterproofing layer of skin |
Stratum Corneum | dead cells |
Dermal Papilla | increased surface area, increased sensitivity, anchors dermis/epidermis, arrangement creates friction ridges (finger prints) |
Stratum Papillare | contains dermal papilla, blood vessels, and nerve endings |
Stratum Reticulare | bundles of collagen (reticular fibers) are responsible for cleavage lines |
Invagination | developmental process that gives rise to hair follicles & glands |
Follicle | continuation of epidermis (stratified squamous epithelium) |
Arrector Pili Muscles | attach b/w hair follicle & stratum papillar of dermis |
Layers of Dermis | Stratum Papillare, Stratum Reticulare |
Types of Skin Glands | sebaceous glands, sudoriferous glands |
Sebaceous Gland | oily gland, secretes sebum |
Sebum | oily substance that lubricates, moisturizes, helps waterproof the skin, and serves as an antimicrobial agent |
Eccerine Sudoriferous Gland | sweat gland, produces watery odorless sweat |
Apocrine Sudoriferous Gland | sweat gland, produces watery sweat that mixes with bacteria on surface of skin and becomes odorous. distributes pheromones |