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integumentary ard

integumentary system

the hypodermis is subcutaneous tissue beneath the skinn consisting mostly of adipose tissue that anchors the skin to the underlying muscle, allows skin to slide over muscle
epidermis is a keratinized stratified squamous epithelium
cells of the epidermis the majority of epidermal cells are keratinocytes that produce keratin. melanocytes are epithelial cells that synthesize the pigment melanin
layers of the epidermis the stratum basale (basal layer) is the deepest epidemal layer and is the site of mitosis the stratum corneum(horny layer) is the outermost protective layer of the epidermis composed of a thick layer of dead keratinocytes
dermis is composed of strong, flexible, connective tissue the dermis is made up of two layers: the thin, superficial papillary layer is highly vascularized areolar connective tissue containing a woven mat of collagen and elastin fibers; and the reticular layer, accounting for 80% of the thickness of the
accounting for 80% of the thickness of the dermis, is dense irregular connective tissue skin color is determined by three pigment:melanin, hemoglobin, and carotene
sweat secretion by sebaceous glands is stimulated by hormones
hairs, or pili, are flexible strands produced by follicles that consist of dead, keratinized cells the main regions of hair are the shaft and the root
a hair has three layers of keratinized cells: the inner core is the medulla, the middle layer is the cortex, and the outer layer is the cuticle
hair pigments(melanin of different colors)are made by melanocytes at the base of the hair follicle.
hair follicles fold down from the epidermis into the dermis and occasionallly into the hypodermis the deep end of a hair follicle is expanded, forming a hair bulb
the wall of a hair follicle is compose of an outer connective tissue root sheath, a thikened basement membrane called a glossy membrane, and an inner epithelial root sheeth associated with each hair follicle is a bundle of smooth muscle cells called an arrector pili muscle
Created by: cathyb



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