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Summary og Gladular epithelia

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Microbiologia

Institución
Universidad Autónoma De Madrid

Epithlia, well detaild explenation, that include diagrams and and visual elements that will help you to undestands fully how it works, it is formed, and all topic related.

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Subido en 12 de enero de 2023
Número de páginas 5
Escrito en 2022/2023
Tipo Resumen

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Week 4 CTL
Biology:
Tissue Tissues
Epithelial Histology I.
(Epithelia, Connective, Muscle, Nervous)

#1. Epithelial Tissues (epithelium):
- One of the 4 basic tissue types (nerve/muscle/connective/epithelial)
- A sheet/sheets of cells that covers a body surface or lines a body cavity.
- Where? : a) Covering & lining epithelium
b) Glandular epithelium
- Epithelia are avascular, but all epithelia "grow" on an underlying layer of vascular connective tissue.
- Form boundaries between different environments. (interface tissue)
- *Nearly all substances received or given off by the body must pass through an epithelium.
- General Functions: - Protection
- Absorption
- Filtration
- Excretion
- Secretion
- Sensory reception

Characteristics of Epithelium:
- Epithelium differ from other types of cells in that they:
o Exhibit Polarity: (apical-basal polarity)
§ Have an apical surface
• Surface exposed to the inside of the lined cavity.
• Most have microvilli (finger-like extensions of the plasma membrane)
• Some have cilia (arms that propel substances in 1 direction – eg. trachea)
o Power & recovery strokes
§ Have a basal surface
• Surface facing connective tissue on the outside of the lined cavity.
• Supported by a Basement Membrane:
o Lining the basal surface is a thin supporting sheet called the basal lamina -determines which
molecules can diffuse through the basal membrane.
o Below the basal lamina is the reticular lamina – fine network of collagen fibres belonging to the
underlying connective tissue.

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, o Bound by specialised contacts:
§ Tight junctions – maintain polarity – protect basal side from apical environment.
§ Desmosomes – resist mechanical forces – holds cells together
§ Gap junctions – Allows intercellular transfers & communication.
o Supported by Connective Tissue:
§ Provide support
§ Reinforces the epithelial sheet
§ Resists stretching/tearing forces
§ Defines epithelial boundary.

www.MedStudentNotes.com

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