Lab: Tissue Identification

Epithelial Tissues: Cover internal and external surfaces Simple Squamous Epithelium: Large, thin cells with “bulging” nucleus Look like sunny-side-up fried eggs Top View Side View Notice 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 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) 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 1. Cardiac Muscle Cell 2. nuclei 3. Intercalated Discs

Skeletal Muscle (Voluntary): Contains many nuclei in one cell (multinucleated) Clearly striated (striped)

Blood Tissue: Red blood cells (no nucleus) Carry oxygen White blood cells (large nucleus) Immune system Platelets Help with clotting Platelets