Tissues

Skin and the Integumentary System A.Skin is composed of 2 primal storeys 1.Epidermis is made of keratinized stratified squamous epithelial tissue, is superficial to the dermis, and is avascular. 2. dermis is mainly connective tissue, is secret to the carapace, and is vascular * The fight marks collagen (for strength) and pliant (for stretch) fibers. * The skin is thicker on the posterior than the anterior parts of the corpse; thicker on lateral parts of limbs than medial parts. Subcutaneous layer (or hypodermis) is deep to dermis, but is not part of skin. It is mainly fatty tissue B.Layers of epidermis (from deepest to superficial) 1.Stratum Basale (= base) a.has stem cellular telephones that continuously divide by mitosis and interrupt rise to the upper layers; they are technically called keratinocytes. b. as well contain Merkel cells which are involved in the sensation of speckle c.has best crease supply of epidermis d.during embryologi cal development, some cells emigrate from here to dermis and cast rise to sweat and inunct glands, and also hair follicles. e.also contains melanocytes, which make melanin 2.Stratum Spinosum (= thorny) 3.Stratum Granulosum (granulum = little grain) a.cells are consequence one to die because 1)they are making lots of keratin. 2)the inwardness of each cell breaks down.

4.Stratum Lucidum (clear): Not present in subdue skin: only in fingertips, palms, and soles Extra layers of skin for areas that bilk extra abrasion 5.Stratum Corneum (cornu = horn) a.25 to 30 layers of cells (so more cell la yers than any other layer) b.cells are comp! letely flat conk out and dead and are continuously shed c.very important hindrance to microorganisms (many, hard layers acts like a wall) d.Callus can orchestrate from these cells; its an abnormal thickening of the epidermis due to word run across to friction. C.The dermis is connective tissue composed of 2 layers: the papillary and the reticular. * It is made of various kinds of loose...If you want to get a fair to middling essay, order it on our website: BestEssayCheap.com

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