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Epithelial Tissues:Cover internal and external surfaces
Simple Squamous Epithelium:•Large, thin cells with “bulging” nucleus•Look like sunny-side-up fried eggs
http://www.uoguelph.ca/zoology/devobio/210labs/epithelial1.html
Top View Side ViewNotice the protruding nucleus
Simple Cuboidal Epithelium:•Almost square in cross section•Edges aren’t apparent, but nuclei (stained purple in this photo) are prominent•Thicker than simple squamous
Simple Cuboidal Cells surrounding a duct
http://www.uoguelph.ca/zoology/devobio/210labs/epithelial1.html
Squamous cells, also on this slide…
Pseudostratified Columnar Ciliated Epithelium:•Columnar= tall, vertical cells•Stratified = nuclei are at approximately the same height (NOT what we’re looking at…)•Pseudostratified = nuclei are at differing heights
faculty.une.edu/com/abell/histo/Histolab4ab.htm
Ciliated = has cilia (microscopic hairs)
Muscle Tissues:3 types: Skeletal, Smooth, and Cardiac
Smooth Muscle (Involuntary):•Forms neat, parallel lines•Features long, narrow "spindle" shaped cells with a single central, somewhat elongated, nucleus. •No striations (see next two slides for comparison)
http://www.uoguelph.ca/zoology/devobio/210labs/muscle1.html
Smooth
muscle here
Not here
Cardiac Muscle (Involuntary):•Intermediate between smooth and skeletal•Faintly striated, multinucleated (more than one nucleus in a cell)•Its cells branch and are joined to one another via intercalated discs
http://www.uoguelph.ca/zoology/devobio/210labs/muscle1.html
1. Cardiac Muscle Cell2. nuclei 3. Intercalated Discs
http://www.mhhe.com/biosci/ap/histology_mh/skmuscls.jpg
Skeletal Muscle (Voluntary):•Contains many nuclei in one cell (multinucleated)•Clearly striated (striped)