Histology of Epithelial Tissues

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Histology of Epithelial Tissues

• Reading Chapter 3 (p. 62-78) in Martinis Human
  Anatomy textbook
• Histology Test (20 pts) Next Week!
• Tissue Drawings (10 pts) Due at Histology
  Test

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• General Features of Epithelial Tissues
• Always have a free surface.
• Cover body surfaces
• Line body cavities
• Line organs, blood vessels, etc
• Cells densely packed (little intercellular
  material)
• Avascular
• Specialized to protect, absorb, and secrete

Simple squamous epithelial tissue
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• Classification of epithelial tissues
• 1) Cell shape (at the free surface)
• 2) Cell layers/arrangement

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• Classification of epithelial tissues
• 1) Cell shape (at free surface)
• a) squamous - flat cells
• b) cuboidal - cube shaped
• c) columnar - column shaped

Reminders -histology thin section of a 3D
object -there are MANY tissues on each slide
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• Classification of epithelial tissues
• 2) Cell layers/arrangement
• a) simple - a single layer
• - relatively thin/fragile
• - tend to line internal structures
• - simple squamous epithelium pictured here
• b) stratified - multiple layers
• -thicker
• -tend to be in areas w/ stress
• -stratified squamous epithelium w/out
  keratin pictured here

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• Name this epithelial tissue

Cell arrangement/layers.Shape of cells at
surface
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Find the arteries and veins in this image. What
type of epithelial tissue lines blood vessels?
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Find the arteries and veins in this image. What
type of epithelial tissue lines blood vessels?
Simple squamous
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Name this epithelial tissue
Figure 3.5a
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• Name this epithelial tissue (far left of view)
  

Cell arrangement/layers.Shape of cells at
surface
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• Name this epithelial tissue

Cell arrangement/layers.Shape of cells at
surface
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Name this epithelial tissue
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Name this epithelial tissue
Figure 3.5b
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• Pseudostratified Columnar (Fig 3.6.d)
• -respiratory tract
• -often have cilia goblet cells
• -looks layered BUT there is really only 1 layer
  of cells with nuclei at different heights

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Name this epithelial tissue
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Name this epithelial tissue
Figure 3.6b
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Name this epithelial tissue
Figure 3.4
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Name this epithelial tissue
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• Name this epithelial tissue

Cell arrangement/layers.Shape of cells at
surface
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Microscopy

• Microscope care
• Microscope use
• Take notes and draw sketches of the tissues you
  observe in lab.
• Quiz 1 at the start of next class (epithelial
  tissues).
• Tissue Drawing Homework due next
  Wednesday/Thursday (at the time of the histology
  test)

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End of Lab 1