3.1 lecture - classification of epithelia - Toth

Question 1

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

Answer 1

cuboidal

Question 2

the epithelium lining the duct of an eccrine sweat gland is…

Answer 2

stratified cuboidal epithelium - 2 layers of cuboidal

Question 3

the ectoderm gives rise to epithelia in these 3 places…

Answer 3

• skin
• oral cavity
• anus

Question 4

the endoderm gives rise to epithelia in these 2 places

Answer 4

• gut tubes

- respiratory tubes

Question 5

the mesoderm gives rise to epithelia in these 2 places

Answer 5

• endothelium of blood and lymph vessels

- mesothelium of peritoneum, pleura, pericardium

Question 6

3 functions of epithelia

Answer 6

• protection
• secretion/absorption
• organization of surrounding tissue

Question 7

disruption of the epithelia is termed ___

Answer 7

ulceration

Question 8

ulceration refers to…

Answer 8

disruption of epithelia

Question 9

this is the only place that stratified cuboidal epithelium is found

Answer 9

duct of eccrine sweat glands

Question 10

stratified columnar epithelium is uncommon, except here …

Answer 10

certain portions of the under eyelid

Question 11

the duct of eccrine sweat glands is the only place this type of epithelium is observed

Answer 11

stratified cuboidal

Question 12

this type of epithelium is uncommon except in certain portions of the under eyelid

Answer 12

stratified columnar

Question 13

how can you tell apart the stratified columnar epithelium, say, of the eye, and the pseudostratified columnar epithelium, say, of the trachea

Answer 13

trachea - pseudostratified columnar mostly ciliated

eyelid - stratified columnar mostly goblet

Question 14

this cell type is often found lining ducts

Answer 14

simple cuboidal

Question 15

T/F there are many different subfamilies of keratin for a cell to choose from

Answer 15

true

Question 16

what kind of specialized protein is found in the nails and hair

Answer 16

specialized keratin

Question 17

T/F stem cells are located in all epithelial layers, usually in contact with the basement membrane

Answer 17

true

Question 18

2 locations of stratified columnar epithelia include:

Answer 18

• trachea

- epididymis

Question 19

where are stem cells located with respect to a hair follicle?

Answer 19

in the “bulge” region of the follicle

Question 20

how do you tell keratinized from non-keratinized

Answer 20

• keratinize - no adluminal nuclei

- nonkeratinized - adluminal nuclei present

Question 21

the vagina is lined with what kind of epithelium

Answer 21

simple squamous nonkeratinized

Question 22

simple squamous keratinized epithelium is found primarily…

Answer 22

in the skin

Question 23

the 2 parts of the cervix are:

Answer 23

• ectocervix

- external os

Question 24

the ectocervix is lined with what kind of epithelium

Answer 24

simple squamous non-keratinized (same as vagina)

Question 25

the external os is lined with what kind of epithelium

Answer 25

simple columnar with picae palmitae (folds)

Question 26

“picae palmitae” =

Answer 26

“palm fronds,” or the pattern of folding in the external os

Question 27

this is an apparently stratified epithelium that reduces to a few layers when stretched

Answer 27

transitional epithelium (bladder)

Question 28

transitional epithelium is also known as…

Answer 28

urinary epithelium - because it is only found in the urinary system

Question 29

this epithelial type is one containing cell types of multiple shapes, though still one-layer thick in that all cells touch basement membrane

Answer 29

pseudostratified epithelium

Question 30

the pseudostratified epithelium in the trachea can alternatively be called…

Answer 30

respiratory epithelia

Question 31

how / where does metaplasia take place in the vagina

Answer 31

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