Epithelial tissue

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Information about Epithelial tissue
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Published on October 16, 2018

Author: hanaasaid

Source: authorstream.com

Epithelial Tissue: E pithelial Tissue B y Dr. H anaa S. Mousa Faculty of Medicine Zagazig University, Egypt Characteristics: Characteristics Sheets of cells on basement membrane, take nutrition from CT lying under it. Cells are joined by cell junctions No blood vessels, no lymphatics Slide 3: Numerous nerve endings High regenerative ability Cells exhibit polarity Slide 4: EPITHELIAL TISSUES HAVE NUMEROUS FUNCTIONS: Protection of underlying tissues of the body from abrasion and injury Transcellular transport of molecules across epithelial layers Secretion of mucus, hormones, enzymes, and so forth, from various glands Absorption of material from a lumen (e.g., intestinal tract or certain kidney tubules) Slide 5: Control of movement of materials between body compartments via selective permeability of intercellular junctions between epithelial cells ( smalll intestine) Detection of sensations via taste buds, retina of the eye, and specialized hair cells in the ear ( neuroepithelium ). Slide 6: Surface Epithelium Simple Epithelium: Simple Epithelium Stratified Epithelium: Stratified Epithelium Myopithelium: Myopithelium Slide 26: Neuropithelium Slide 29: Glandular Epithelium Types of Glands: Types of Glands Slide 31: Mixed e.g. pancreas Exocrine Glands: Exocrine Glands Slide 33: Mechanism of secretion Slide 34: Nature of secretion Gland with special secretion: Gland with special secretion Fatty: Sebceous Waxy: ceruminous Cellular: testis, ovary Slide 36: Number of cells

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