lecture_2_-_histology

lecture_2_-_histology - Lecture 2 - Histology Tissue A...

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Lecture 2 - Histology 1 Tissue A group of cells of similar structure that perform a common function. 1 ¾ There are 4 types of tissue: 1. Epithelium 2. Connective 3. Muscle 4. Nervous ¾ Groups of tissues form organs Epithelial Tissue ¾ Epithelium A sheet of cells that COVERS a body surface or lines a body cavity. ¾ Examples: outer skin inner lining of stomach 3 Examples: outer skin, inner lining of stomach, respiratory tubes, lining of blood vessels, and most of the body s glands. ¾ Functions of Epithelial Tissue: ¾ Protection, sensory reception, absorption, ion transport, filtration, secretion (Glandular) Classification of Epithelia ¾ Number of layers 1. Simple (single layer) 4 2. Stratified (more than one layer Cell Shape) ¾ Cell Shape 1. Squamous Platelike 2. Cuboidal Shaped like cubes 3. Columnar Taller than wide
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Lecture 2 - Histology 2 Stratified Epithelium ¾ Multilayered and thick (2 or more layers). 10 ¾ Resists abrasion, Protection. ¾ Basal cells divide & push apically to replace older surface cells. Stratified Cuboidal & Columnar Epithelium ¾ Uncommon type of tissue. 12 ¾ Located in the large ducts of glands. Ex: Sweat glands, mammary glands, salivary glands.
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Lecture 2 - Histology 3 Glands ¾ One or more cells specialized to secrete a product. Usually proteins. 16 ¾ Transforms substances from the blood into a product that is discharged from the gland. ¾ There are two types: 1. Exocrine (Unicellular or Multicellular) 2. Endocrine (Ductless Secrete hormones) Epithelial Surface Features ¾ Tight junctions (Belt like junction) 9 Prevents molecules from passing between 17 ¾ Adhering junctions (Reinforces tight junctions) 9 A type anchoring junction ¾ Desmosomes (Binding Bodies) 9 Act like Rivets - A type anchoring junction ¾ Gap junctions (Tunnel-like junction) 9 Allow passage of ions Basal Epithelial Features
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This note was uploaded on 01/16/2012 for the course BI 200 taught by Professor Potter during the Fall '11 term at Montgomery College.

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lecture_2_-_histology - Lecture 2 - Histology Tissue A...

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