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Epithileum Cheat Sheet

By: Callie Wilkes

Anatomy & Physiology

2350-010

Epithelial Tissues

  • Offers the body protections and covers vital organs
  • Lines the throat and anus
  • Acts like a filter and absorbs nutrients
  • Controls excretions (urine and deffication) as well as secretions (sweat)

Epithelial Tissues

Specialized

Features

  • Can form sheets; cellularity
  • Uniquely strong contact points; junctional complexes
  • Contains nerves (innervated) yet doesn't have a blood supply (avascular)
  • Can regenerate cells

Classifications of Epithelia

Classification

  • Stratified= more than one layer of cells
  • Simple= a single layer
  • Squamous= flat and thin, basically squished cells
  • Cuboidal= square shaped and thicker than squamous cells
  • Columnar: rectangular, thin and tall cells
  • Psuedostratified: looks like more than one layer with no difinitive shape, more than one of the other shapes are present

Simple Epithilial

Tissue

  • Single cell layers and thin
  • Simple Squamous Epithelium: found in the kidney and the respiratory tract
  • Simple Cuboidal Epithelium: found in glandular tissue and in kidney tubules
  • Simple Columnar Epithelium: found in the uterine tube
  • Pseudostratified Columnar Epithelium: found in the upper respiratory tract and the urethra

Stratified

Epithelial Tissue

Stratified Epithelial

  • Multiple cell layers that regenerate from the basal layer (bottom) to the apical layer (top)
  • Keratinized squamous epithileum= hair, nails, hooves, horns, and wool
  • Keratinization of cells occurs and the surfacd layers are filled with granuels of keratin

Stratified Cuboidal Epithileum

Stratified Cuboidal & Columnar

  • Is generally two layers and found along excretory ducts
  • Also found in sweat glands, mammary glands, and salivary glands
  • Protects deeper cell layers

Stratified Columnar Epithileum

  • Only found in few parts of the respiratory and reproductive systems
  • Also found in the digestive system and some of the excretory ducts

Transitional Epithileum

Transitional

  • Resembles columnar and cuboidal cells
  • Is very stretchy
  • Found in the urinart tract and in the urethra
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