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Skin diagram

Terms in this set (24)

hair shaft
Projects above the skin's surface.
epidermis
Thick, keratinized stratified squamous epithelium; avascular; most cells are keratinocytes.
dermis
Composed of dense irregular connective tissue; vascularized; supplied with receptors; cells- fibroblasts- make fibers and macrophages (- eats bacteria).
hypodermis (subcutaneous layer)
Composed of adipose tissue; functions as a site for storage, shock absorber, insulates deep tissue, and anchors skin to underlying tissues.
Arrector pili
Smooth muscle; pulls hair upright when cold or frightened.
Eccrine sweat gland
Abundant of palms, soles of feet, and forehead; regulates body temp. through pores @ skin surface; produce clear sweat.
apocrine sweat gland
Found mainly in armpit and genital area; ducts empty into hair follicle; function at puberty; release sweat that contains fatty acids and proteins.
root hair plexus
Nerve endings that wrap around the hair bulb that sense shaft movement.
cutaneous vascular plexus
sensory nerve fiber
sebaceous gland
Produces sebum (lubricant for skin, prevents brittle hair, kills bacteria); activated at puberty; cause of acne; ducts empty into hair follicles (but some empty into skins surface).
hair root
Embedded in the skin
hair follicle
Extends from epidermis to dermis; ending of the hair root.
papillary layer
Contains projections called dermal papillae; upper dermal region.
stratum corneum
Protective layer; outermost 20-30 dead keratinocytes of epidermis; rubs off as dandruff.
reticular layer (of dermis)
Contains blood vessels, sweat and oil glands, and deep pressure receptors; lower dermal region.
stratum granulosum
3-5 layers of keratinocytes containing granules of keratin.
stratum spinosum
Layers of flattened irregular cells; intermediate filaments made of pre-keratin.
stratum basal
Cells undergo rapid mitosis; Deepest layer of epidermis.
keratinocytes
Located in the stratum spinosum; produce keratin- fibrous protein; flake off when they reach the apical surface.
Merkel cells
Found between dermal and epidermal layers; associated w/sensory nerve endings as touch receptors.
melanocytes
mostly in stratum basal; produce melanin
dendritic cell
activate the immune system when bacteria and viruses are present; located in the stratum spinosum.
Stratum lucidum
Only in thick hairless skin of the palms of the hands and soles of the feet; formed from dead keratinocytes.
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