BIOSC-139 Lecture Notes - Lecture 20: Basal Lamina, Brush Border, Wound Healing

• School: Diablo Valley College
• Department: Biological Science
• Course: BIOSC-139
• Professor: hoffman

Document Summary

Apical surface of epithelial tissues: may be smooth & slick, most have microvilli (e. g. , brush border of intestinal lining, some have cilia (e. g. , lining of trachea) Basal surface of epithelial tissues: noncellular basal lamina, glycoprotein and collagen fibers lies adjacent to basal surface, adhesive sheet, selective filter, scaffolding for cell migration in wound repair. Characteristics of epithelial tissue: specialized contacts: covering and lining epithelial tissues fit closely together, form continuous sheets, specialized contacts bind adjacent cells, lateral contacts, tight junctions, desmosomes. Characteristics of epithelial tissue: avascular but innervated: no blood vessels in epithelial tissue, must be nourished by diffusion from underlying connective tissues, is supplied by nerve fibers. Cells of epithelial tissues: squamous cells, flattened and scale-like, nucleus flattened, cuboidal cells, boxlike, nucleus round, columnar cells, tall; column shaped, nucleus elongated. Classification of epithelia: simple epithelia: absorption, secretion, filtration, very thin.