KAAP309 Lecture Notes - Lecture 4: Zipper, Serous Fluid, Elastic Cartilage
14 Sep 2016
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4 types of tissue: epithelial, connective, muscle, nerve, epithelial. Has sidedness one side faces the outside world and the other faces the inside of the body: apical = side that faces outside, ex: skin, mouth, airways, gi/urinary tract. Cells are tightly linked to one another: tight junctions = zipper like, desmosomes = mechanical strength to not be pulled apart. Supported by connective tissue: basal lamina thin layer of ecm, reticular connective tissue not epithelial. High regeneration rate because so exposed: large number of cancers are related to the epithelial tissue. 2 part names: cell layers, 1 = simple, 2 = stratified, shape (of apical layer in stratified, flat = squamous, cube-like = cuboidal, tall/skinny = columnar. Structural elements: ground substance (between the cells, fibers: Areolar: support, hold fluid, defense against infection a. ii. Reticular: like areolar but with more open space (lymphocytes; lymph nodes; spleen; bone marrow: dense (fibrous: fibers are main part) b. i.
