EX3; Oral Mucosa Sensations Flashcards Preview

May14 Oral Histology > EX3; Oral Mucosa Sensations > Flashcards

Flashcards in EX3; Oral Mucosa Sensations Deck (74)
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1

What are the three parts of the dorsal tongue

root
body
terminal sulcu

2

Where are the root and the body of the tongue derived from

body = mucosa from branchial arch 1
root = mucosa from branchial arch 3

3

What kind of keratinization of the epithelium is located on the dorsal tongue

most keratinized except for in a few key locations

4

What kind of lamina propria does the dorsal tongue contain

flexible; other side is more rigid

5

True or False
The dorsal tongue does not contain a submucosa

True

6

The dorsal tongue contains numerous papillae, what different kinds

some papillae are taste buds
some papillae are innervated by somatosensory nerve endings

7

True or False
Sensation is only registered from the tongue

False; it is in the mucosa as well

8

What cranial nerves supply taste to the taste buds

facial - VII
glossopharyngeal - IX
vagus - X

9

This cranial nerve supplies the anterior mouth

trigemial - V

10

This cranial nerve supplies the posterior tongue and pharync

glossopharyngeal - IX

11

These fibers supply a touch sensation

A beta
A delta

12

These fibers supply a warming sensation

C fibers

13

These fibers supply a cooling sensation

A delta

14

These fibers supply a painful sensation

A delta
C fibers

15

This somatosensory receptor is associated with large axons (A beta) and terminates in the superficial lamina propria between the rete pegs

Meissner's corpuscles

16

What kind of forces are associated with Meissner's corpuscles

dynamic forces; rapidly adapting

17

This somatosensory receptor is associated with large axons (A beta) and terminus at the apices of the tete pegs

Merkel receptors

18

What kind of forces are associated with Merkel receptors

static forces; slowing adapting

19

This somatosensory receptor complexes of nerve endings and specialized epithelial cells

Merkel receptors

20

This somatosensory receptor complexes of nerve endings encapsulated by non-nueronal cells

Meissner's corpuscles

21

What kind of threshold do both Merkel and Meissner's receptors have

very low threshold; very sensitive

22

True or False
Merkel's receptors only respond during static forces

False; they also respond during dynamic, but also (and solely) during static, Meissner's does not respond during static

23

True or false
Merkel and Meissner's receptors code painful senstations

False; they do not because their dynamic range does not extend to the noxious (harmful) range

24

What is used to transmit painful sensations

nociceptors
free nerve endings
A delta and C fibers

25

What are the main functions of the taste system

detect chemicals in the food
distinguish between nutritive/non-nutritive
detect harmful substances

26

What are the 5 classes of taste receptors that detect the 5 classes of stimuli

sugars (sweet)
amino acids (umami)
salts (salty)
acids (sour)
varied alkaloid, purines, glycosides (bitter)

27

This is goblet shaped closed of 40-60 cells at right angles to the basal lamina extending to the surface containing microvili and a taste pore

taste bud

28

True or False
There are no nerve fibers at the base of taste buds

False; there are primary afferent fibers at the base and some bud cells synapse with these fibers

29

How may taste buds are distributed in the mouth

around 8,000

30

Where are the taste buds located

68% on the tongue
27% on pharynx/larynx
5% on soft palate