Surface epithelium

Julius Loges

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Julius Loges

1. Definition

Surface epithelium is a layer of highly compacted cells that covers the external and internal surfaces of the body, including the skin, organs, and cavities. Its functions include protection, secretion, and absorption.

2. Classification

2.1. after number of cell layers

Simple epithelium
Pseudostratified epithelium
Stratified epithelium

2.2. after form of the cell

Squamous epithelium
Cuboidal epithelium
Columnar epithelium

2.2. after level of keratinization

keratinized
non keratinized

Also there is transitional epithelium (urothelium)

3. Tips for recognizing different epithelia

Simple squamous and stratified epithelia: Never have surface projections

Simple cuboidal: no surface projections (e.g., duct of a gland), brush border (e.g., kidney tubules)

Simple columnar: no surface projections (duct of a gland), brush border (e.g., intestines), kinocilia (e.g., fallopian tube)

Pseudostratified: almost ALWAYS have surface projections (sterocilia – epididymis, kinocilia – respiratory tract), no surface projections in certain ducts

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Last edit:

2024-12-26 19:23:38

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Surface epithelium

Julius Loges

Table of Contents

1. Definition

2. Classification

3. Tips for recognizing different epithelia

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