Epithelium Flashcards
What are the two types of epithelium?
Surface epithelium and glandular epithelium
What are the functions of epithelium?
Protection, secretion, receptors, absorption, barrier
What are the characteristics of epithelium?
Polar (different domains), avascular, cells are connected by cell junctions, has a basement membrane
What are the different classifications of surface epithelium?
simple squamous, simple columnar, simple cuboidal, pseudostratified ciliated columnar, stratified squamous, stratified cuboidal, transitional
What does simple squamous epithelium look like?
One layer of flat cells
Where is simple squamous epithelium found?
mesothelium (lining of body cavity), endothelium (lining of heart), lining of alveoli, glomeruli
What does simple cuboidal epithelium look like?
One layer of cube like cells
Where is simple cuboidal epithelium found?
thyroid follicles, renal tubules
What does simple columnar epithelium look like?
One layer of tall (columnar) cells - can either be ciliated or non ciliated
Where is simple columnar epithelium found?
Non ciliated in stomach, intestines, gall bladder, bile ducts, endometrium, endocervix and ciliated in fallopian tubes and bronchioles
What does pseudostratified ciliated columnar epithelium look like?
It looks stratified but is actually simple (only one cell layer) because the cells are so long - but really each cell touches the basement membrane
Where is pseudostratified ciliated columnar epithelium found?
In the respiratory tract - non ciliated is found in the vas deferens and the epididymus
What does stratified squamous epithelium look like?
Only the top layer of cells are actually squamous cells - there are then several layers of cells down to the basement membrane - there are two types keratinising and non keratinising
Where is stratified squamous epithelium found?
keratinising is found in the skin, non keratinising is found in the oral cavity, oesophagus, vagina, ectocervix, anus
What does stratified cuboidal epithelium look like?
It is two layers of cuboidal cells
