KAAP309 Lecture Notes - Lecture 4: Stratified Squamous Epithelium, Reticular Connective Tissue, Electron Microscope
18 May 2018
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Ch. 4: Tissues
I. Overview
A. Microscopy
B. Epithelial tissue
C. Connective tissue
D. Nervous tissue
E. Muscle tissue
F. Covering and lining membranes
G. Wound repair, development
II. Microscopy
A. Microscopic anatomy
B. Fix (preserve)
C. Section (slice)
D. Stain (add contrast)
1. Light microscopy
a) Add color
b) Different stains for different tissues
i. H&E the default
c) Different aspects of different tissues
2. Electron microscopy
a) Add heavy metal to deflect electron beam
E. Artifacts of fixation, sectioning, staining
III. Epithelial Tissue
A. Special characteristics
1. Polarity, sidedness: apical (microvilli), basal
2. Specialized contacts on the sides: tight junctions, desmosomes
3. Supported by connective tissue: basal lamina (noncellular) and reticular
connective tissue below
4. Avascular, innervated
5. High regeneration rate
B. Classification
1. Two-part names
2. Part 1: simple layers
a) Simple (1)
b) Stratified (>1)
3. Part 2: shape (of apical layer in stratified)
a) Squamous (flat)
b) Cuboidal (cube-shaped)
c) Columnar (long, column-shaped)
C. Types of epithelium
1. Simple squamous
a) Single layer of flatted cell
b) Allows passage of materials by diffusion
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