BLG 700 Lecture Notes - Lecture 2: Stratified Squamous Epithelium, Simple Squamous Epithelium, Basal Lamina
25 Oct 2016
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Document Summary
Tissues: collections of specialized cells and their extracellular matrix (non-cellular extracellular substance surrounding them) that perform a relatively limited number of functions. 4 primary tissue types: epithelial, connective, muscle and nervous (fig 3. 1) A sheet of cells that covers an exposed surface or lines an internal cavity or passageway. Cellularity composed almost entirely of cells with very little extracellular matrix and closely bound by specialized junctions. Attachment: basal lamina = specialized type of extracellular material secreted by epithelial and connective tissue. Important role in tissue repair cells (fig 3. 3) The second deeper layer, dense layer contains coarse proteins that give the basal lamina strength. Avascular = contains no blood vessels therefore relies on diffusion or absorption of gases and nutrients from blood vessels located in underlying connective tissue (basal or apical surface contacts). Regeneration continually replaced by division of stem cells found close to basal lamina.
