Histology: epithelium Flashcards
Epithelial Tissue:
Covers exposed surfaces and lines body cavaties
Always a vascular (no blood vessels)
4 Basic Tissue Types:
- Epithelium
- Connective
- Muscle
- Nervous
Connective tissue:
Protects, supports and interconnects body parts and organs
Cells, protein fibers and ground substance
Muscular tissue:
Produces movement
Nervous tissue
Conducts impulses for internal communication.
Histology:
The study of microscopic tissues
3 types of cell junctions
- Tight
- Gap
- Desmosomes
Tight junctions
Fused by membranes- reduces ability of molecules to pass between them.
Encircles cells
Gap junctions:
Directly connected by cytoplasm- allows molecules, ions & electrical impulses to pass
Tunnel like
Desmosomes junctions
Button- like; binds cells together & act like an anchor
Only at stress points
Hemidesmosomes attach cell base to basement membrane (PAC man bite to connect)
4 characteristics of epithelial tissue
- Cellular
- Polar
- Basement membrane
4.
3 ways to classify epithelial tissue
- # of layers
- Cell shape
- Surface
3 types of epithelial layered tissue
- Simple
- Stratified
- Pseudo stratified
Simple epithelial
One layer thick
Stratified epithelial:
More than one layer thick
Pseudo stratified:
Looks like many layers - but really only one layer. Look at basement membrane to identify these.