Anatomy and Cell Biology 3309 Lecture Notes - Lecture 4: Genitourinary System, Autonomic Nervous System, Peripheral Nervous System
5 Apr 2018
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Document Summary
All epithelia lie on a basement membrane. Nervous tissue: peripheral nervous system, central nervous system: control system that uses electrical and chemical signals throughout the body. Epithelia is found in any surface in the body both internally and externally: e. g. lungs lined up epithelial, urogenital tract, gastrointestinal tract. Blood vessels are lined by a form of epithelia. Skin is a waterproof barrier: secretion, glands involved in secretion, absorption, lining of gut involved in taking in nutrients, transport, have materials brought into the body through epithelium, receptor. An epithelium with a free surface (sphere or hollow tube not determinable) Tube/sphere is lined by a single layer of nuclei (basophilic) and square looking cells surrounding each of the nuclei. Common in epithelia: have a free border, have a basal layer in contact with connective tissue. Epithelia have polarity (luminal/external side and basal side) Surface of the cell that is in contact with the luminal side = apical domain (top)
