Oral epithelium

Question 1

what forms the surface of the oral mucosa?

Answer 1

oral epithelium

Question 2

mucosa : wet surface , made of :

Answer 2

epithelium

surface epithelium

underlying connective tissue

separating basement membrane

Question 3

where is oral epithelium derived from ?

Answer 3

ectoderm (embryonic )

similar to skin

Question 4

what type of epithelium is oral epithelium ?

Answer 4

stratified squamous epithelium

Question 5

oral epithelium can be categorized into 2 main groups based on keratin . what are these 2 groups ?

Answer 5

keratinized and non-keratinized

Question 6

wat are the 2 types of keratinized oral epithelium ?

Answer 6

ortho-keratinized : do not have any uncle or organelles

para-keratinized :pyknotic nucleus and other organelles remain in the keratinized layer

Question 7

what are the layers of oral epithelium ?

Answer 7

keratinocytes and other scattered cells named nonkeratinocytes

Question 8

what are the cell layers that are considered keratinocytes ?

Answer 8

basal cell layer ( stratum basal )

prickle cell layer ( stratum spinosum)

granular cell layer ( stratum granulosum )

keratin layer (stratum corner)

Question 9

what is the basal cell layer?

Answer 9

first layer resting on basement membrane

cuboidal or low columnar cell

one single layer

very active in division ( maximum mitotic activity )

heals wounds

Question 10

what is the prickle cell layer ?

Answer 10

several layer from polyhedral cells (cells with more than one side )

forms the most abundant type of cell in oral epithelium

called stratum spinous because they have desmosomes that have a spine like appearance when the cell shrinks during processing

Question 11

basal cell layer and part of prickle cell layer can divide and renew defective epithelium . what are these cell layers referred to as?

Answer 11

stratum germinativum

Question 12

what is granular cell layer ?

Answer 12

flat 3-5 cell layers that are prominent in keratinized epithelium and absent in non keratinized epithelium

they contain keratohyaline granules in their cytoplasm that help form the matrix of keratin fibers in superficial layer

Question 13

what is the stratum corneum ?

Answer 13

flat and filled with keratin filament

continuously being desquamated and replaced by epithelium cells that migrate from underlying layers

Question 14

what are some non keratinocytes present in the oral epithelium ?

Answer 14

scattered in between keratinocytes

there are 4 types :

melanocytes

mangerhans cells

Merkel cells

inflammatory cell

Question 15

what are melanocytes , where are they located and what is its function?

Answer 15

responsible for secretion of melanin

scattered between basal cell layer

Question 16

all humans have same number of melanocytes , but activity is different .

Answer 16

..

Question 17

what are langerhans cells ? where are they present ? where do they come from , and what are its functions ?

Answer 17

can be found above the basal (supra basal)

derived from bone marrow

plays an important role in immune system as antigen presenting cell

Question 18

what is Merkel cell?

Answer 18

cells present in basal cell layer

they play an important role in neural sensation , especially touch

has desmosomes

Question 19

what are inflammatory cells ?

Answer 19

can be seen in oral mucosa

are mainly 3 types

Question 20

what are inflammatory cells ?

Answer 20

can be seen in oral mucosa

are mainly 3 types

plays an important role in defense against foreign bodies