epithelium · 2021. 3. 1. · 4.nervoustissue. 1. covering, lining, and protecting surfaces...
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EPITHELIUM
Major tissue types:
1. Epithelium
2. Connective Tissue.
3. Muscle Tissue.
4. Nervous Tissue.
1. Covering, lining, and protecting surfaces (skin/epidermis)
2. Absorption (intestinal lining)
3. Secretion (glands)
Characteristic ■ Supported by the underlying connective tissue.
■ Innervated (has nerves).
■ Avascular (no blood vessels); blood supply is in supporting connective tissue.
■ High regeneration capacity.
■ Polarized tissue.
Basement membrane (BM)(Epithelium and CT0
■ Is a thin extracellular sheet under epithelium.
■ Synthesized by epithelium and CT
■ Support, attach, and filter.
■ Two layers
1. Basal lamina (Collagen IV, laminin, and Nidogen+perlacan)
2. Reticular lamina (Collagen III and VII)
Basement membrane
CT
Epithelium
Basement membrane
Basement membrane
Electron microscope (TEM) Picrosirius-hematoxylin
Types of Epithelial tissue