Histology Flashcards
Lines the surface of the body, hollow organs, and spaces
Epithelium
Contracts to generate a pulling or squeezing force
Muscle tissue
Allows electrical information to be carried from one place to another
Nervous tissue
Provides support, fills in spaces, connects other tissues to each other
Connective tissue
Lines inside of hollow organs such as blood vessels, bladder, and intestines
Epithelium
Functions: Protection, absorption, secretion, filtration
Epithelia
Separates the epithelium and connective tissues
Basement membrane
This has 1 layer
Single epithelium
This has 2 or more layers
Stratified epithelium
This has 1 layer, but looks like there are many layers
Pseudo-stratified epithelium
These are flat cells(near free surface)
Squamous
Cells that are as wide as tall
Cuboidal
Cells that are taller than they are wide
Columnar
Go back and forth between flat and cuboidal
Transitional epithelium
Single layer of flat cells. Only will be able to identify the nuclei running parallel to the surface. Cytoplasm is too thin to see.
Simple squamous epithelium
Lines digestive system distal to the esophagus(stomach, small intestine, large intestine) and is found in other places
Simple columnar epithelium
Found in places subject to a lot of mechanical abrasion such as the skin, mouth, esophagus, and vagina
Stratified squamous epithelium
Rare and hard to identify with light microscopes
Stratified cuboidal and stratified columnar epithelia
Many cells lie near the base of the tissue, next to the connective tissue, but only a few of these reach the surface of the tissue. Many more nuclei at the base than at the surface. Those that do not reach the surface are columnar in shape.
Pseudo-stratified columnar epithelium
Stratified type of epithelium cells are cuboidal when the tissue is relaxed, but can become flattened as they get stretched out
Transitional epithelium
Surface cells are large and relatively clear, while deeper cells are packed more closely together
Transitional epithelium
Fewer cells but a large amount of space between them(extracellular matrix)- gives tissue its characteristic appearances and functions
Connective tissue
Composed of ground substance and fibers
Extracellular matrix
Consists of water with many other molecules dissolved in it(mostly proteins and polysaccharides)
Ground substance