ex3 oral mucosa

Question 1

how many tissues compose the mucous membrane of the oral cavity (though applies to mucous membrane in general) .. and what are those tissue (s)

Answer 1

two different tissue types compose the mucous membrane Organ.

• epithelium
• lamina propria (underlying CT connective tissue )

Question 2

while not present throughout the entire oral mucous membrane, when present, where is the submucosa located?

Answer 2

when present, the submucosa layer is located deep to the lamina propria (which is the layer deep to the superficial-most epithelium)

Question 3

does the oral mucous membrane contain blood vessels?

Answer 3

Yes! the oral mucous membrane contains blood vessels - the vessels are found in the lamina propria and submucosa (when present)

Question 4

what kind of gland is found in the submucosa/ lamina propria of the oral mucous membrane?

Answer 4

Salivary glands are located in the lamina propria (and predominantly in the submucosa, when submucosa is present) of the oral mucous membrane,

the salivary glands are important for lubricating the mucous surface via ducts that go to the surface and empty mucein contents onto the surface (hence, moist)

Question 5

The mucuos membrane is vacularized.. do the blood vessels travel in/through the oral epithelium (most superficial layer)?

Answer 5

No. WTe blood vessels of the oral mucous membrane are in the lamina propria and submucosa layers and NOT the superficial oral epihelium layer

Question 6

in what range pH are most soft drinks?
0-2
2-4
4-6
6-8
8-10?

Answer 6

Most soft drinks are really acidic with pH’s in the range of 2-4pH.

Question 7

what are beta-defensins and where are they found?

Answer 7

Beta-defensins are anitmicrobials secreted by the eptihelial cells of the oral mucosa.. hence epithelium has an immune function

Question 8

is the lamina propia or the epithelium more anti-microbial protective?

Answer 8

the lamina propria has more immune cells than does the epithelium. the epithelium specifically secretes beta-defensins as antimicrobials. (though the lamina propia has access to the immune cels via blood supply…)

Question 9

T/F oral mucosa is highly innervated

Answer 9

True. oral mucosa is highly innervated. The nerve fibers are A-beta and A-delta,

A-beta detects –TOUCH
A-detla– detects taste, temperature, and pain

Question 10

what sensations does hte oral mucosa detect?

Answer 10

Te oral mucosa is innervated (richly) by A-beta and A-delta fibers. These a-delta fibers detect touch, taste, temperature, and pain
– specifically, A-beta fibers = touch
A-delta fibers = taste, temperature and pain

Question 11

what kind of innervation fibers are present in the dentin? what sensation(s) are detected?

Answer 11

The dentin has the same fibers as present in the pulp– A-delta, A-beta, and C fibers.. and these mostly all detect PAIN

Question 12

what kind of innervation fibers are present in the pulp, and what sensation(s) are detected?

Answer 12

The pulp has the same innervation scheme as the dentin. Both have A-delta, A-beta, and C fibers which solely detect PAIN

Question 13

is the periodontal ligament innervated?

Answer 13

Yes! the periodontla ligament is innervated. the PDL has a-delta and C fibers that both detect Pain, the PDL also has A-beta fibers that are PROPRIOCEPTIVE

Question 14

what nerve fibers are present in the PDL and what sensations does it detect?

Answer 14

The PDL senses pain and proprioception .

A-delta and C fibers are for Pain, whicle A-beta fibers detects proprioception

Question 15

The oral mucosa varies by region– but always has 2 types of tissue, which are:

Answer 15

epithelium and connective tissue. == these are the two tissues always present in oral mucosa despite the variation

Question 16

T/F all oral epithelium is tall columnar

Answer 16

False. All oral eptiehlium is stratified squamous eptiehlium ((layers and squished looking cells))

Question 17

T/F new cells are found at the basal cell layer and migrate superficially where they mature and eventually slough off

Answer 17

True. immature cells are deepest in the basal cell layer.. as they mature they move superifically uintil they eventually slough off

Question 18

Is the oral mucosa radiosenstive or radioresistnat?

Answer 18

The oral mucosa has fast turnover – so the cells are renewing.. this makes the oral mucosa radiosensitive as radiation therapies impact most cells of high division, long division life, and undifferentiated.

Question 19

put these in order of turnerover (renewal) times for the cells::

skin
gut
oral epithelium (gingiva, cheek, junctional epithelum, tast buds..)

Answer 19

The skin has the longest turnover , then the oral epithelium, and the gut epithelium has the fastest turnover

Question 20

T/F Thus the term mucosa or mucous membrane always refers to the combination of the epithelium plus the lamina propria

Answer 20

True. the term mucosa, or mucous membrane always refers to the combination of the epithelium plus the lamina propria

** The connective tissue of the lamina propria is very loose allowing it to be very cell rich. The cell population of the lamina propria is very varied including, for example, fibroblasts, lymphocytes, plasma cells, macrophages, eosinophilic leukocytes, and mast cells.[2] It provides support and nutrition to the epithelium, as well as the means to bind to the underlying tissue. Irregularities in the connective tissue surface, such as papillae found in the tongue, increase the area of contact of the lamina propria and the epitheliu

Question 21

how are the epithlial cells of the oral mucosa connected to one-another?

Answer 21

the epithelial cells of the oral mucosa are connected via desmosomes. this helps make the epithelia a protective barrier