ANAT 215 Lecture Notes - Lecture 3: Maple Syrup, Myoepithelial Cell, Basal Lamina
7 Aug 2015
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Lectures 3 & 4 ~ basic tissues [trillions of cells; 200 cell types; four types of tissue. ] Epithelial tissue [8 types; no space between cells; covers surfaces and lines body cavities and vessels] Cellularity: adjacent cells are joined and anchored by specialized junctions. Polarity: has an apical surface [to exterior] and an attached basal surface to underlying tissue. Attachment: epithelial cells rest on and are attached to the basal lamina [basement membrane]. Avascularity: epithelial tissue has no direct contact with blood vessels. Cell organization: is either simple [one layer of cells] or stratified [two or more layers of cells]. Physical protection: protects exposed and internal surfaces from dehydration and invasion. Permeability: all substances entering or exiting the body must pass through the epithelium. Sensation: neuroepithelial cells detect and transfer changes to the cns. Contractility: myoepithelial cells have contractile proteins such as in muscle and can contract. Secretion: glandular epithelial cells secrete bodily products: simple squamous:
