3.1 lecture - classification of epithelia - Toth Flashcards
in this cell shape there is not much cytoplasm, the nucleus occupies almost the whole cell, and it is rare to get a cross section without the nucleus
cuboidal
the epithelium lining the duct of an eccrine sweat gland is…
stratified cuboidal epithelium - 2 layers of cuboidal
the ectoderm gives rise to epithelia in these 3 places…
- skin
- oral cavity
- anus
the endoderm gives rise to epithelia in these 2 places
- gut tubes
- respiratory tubes
the mesoderm gives rise to epithelia in these 2 places
- endothelium of blood and lymph vessels
- mesothelium of peritoneum, pleura, pericardium
3 functions of epithelia
- protection
- secretion/absorption
- organization of surrounding tissue
disruption of the epithelia is termed ___
ulceration
ulceration refers to…
disruption of epithelia
this is the only place that stratified cuboidal epithelium is found
duct of eccrine sweat glands
stratified columnar epithelium is uncommon, except here …
certain portions of the under eyelid
the duct of eccrine sweat glands is the only place this type of epithelium is observed
stratified cuboidal
this type of epithelium is uncommon except in certain portions of the under eyelid
stratified columnar
how can you tell apart the stratified columnar epithelium, say, of the eye, and the pseudostratified columnar epithelium, say, of the trachea
trachea - pseudostratified columnar mostly ciliated
eyelid - stratified columnar mostly goblet
this cell type is often found lining ducts
simple cuboidal
T/F there are many different subfamilies of keratin for a cell to choose from
true
what kind of specialized protein is found in the nails and hair
specialized keratin
T/F stem cells are located in all epithelial layers, usually in contact with the basement membrane
true
2 locations of stratified columnar epithelia include:
- trachea
- epididymis
where are stem cells located with respect to a hair follicle?
in the “bulge” region of the follicle
how do you tell keratinized from non-keratinized
- keratinize - no adluminal nuclei
- nonkeratinized - adluminal nuclei present
the vagina is lined with what kind of epithelium
simple squamous nonkeratinized
simple squamous keratinized epithelium is found primarily…
in the skin
the 2 parts of the cervix are:
- ectocervix
- external os
the ectocervix is lined with what kind of epithelium
simple squamous non-keratinized (same as vagina)
the external os is lined with what kind of epithelium
simple columnar with picae palmitae (folds)
“picae palmitae” =
“palm fronds,” or the pattern of folding in the external os
this is an apparently stratified epithelium that reduces to a few layers when stretched
transitional epithelium (bladder)
transitional epithelium is also known as…
urinary epithelium - because it is only found in the urinary system
this epithelial type is one containing cell types of multiple shapes, though still one-layer thick in that all cells touch basement membrane
pseudostratified epithelium
the pseudostratified epithelium in the trachea can alternatively be called…
respiratory epithelia
how / where does metaplasia take place in the vagina
when columnar epithelium are exposed to the vaginal lumen (pH, bacteria, etc) the typically simple columnar epithelium of the cervix undergoes metaplasia into the SSNK of the vagina
