Gustatory System Flashcards
1
Q
tongue
A
- responsible for gripping and repositioning food btwn teeth to form a bolus
- pushes bolus toward pharynx to be swallowed
2
Q
apex
A
anterior of tongue
3
Q
root
A
part of tongue that is attached to floor of posterior surface of mouth
4
Q
frenulum
A
located on inferior surface of tongue along midline
5
Q
papillae
A
- raised bumps on tongue
- help grip food
- 2 types contain taste buds
6
Q
types of papillae (3)
A
- circumvallate
- fungiform
- filiform (do not contain taste buds)
7
Q
taste buds
A
- contain chemical receptors stimulated by the cehmical composition of food
- found primarily on tongue (on circumvallate and fungiform papillae), also on mouth surface and pharynx wall
- made up of 3 types of cells
8
Q
gustatory cells
A
- chemical receptor cells in taste buds
- each terminates in a gustatory hair
9
Q
basal cells
A
- act as stem cells for taste buds
- divide into new supporting cells that then form gustatory cells
10
Q
supporting cells
A
- make up the bulk of tastebuds
- separate taste receptor cells (gustatory cells) from each other
11
Q
nociceptors
A
- pain receptors
- found on tongue, contribute to sense of taste
12
Q
thermoreceptors
A
- temperature receptors
- found on tongue, contribute to sense of taste
13
Q
gustatory hairs
A
- part of gustatory cells, project into saliva to detect food chemicals
- when detect a chemical, cause action potential to generate in the dendrites wrapped around gustatory cells
14
Q
taste pathway (4 steps)
A
- food chemicals contact gustatory hairs, generation action potential in the dendrites wrapped around gustatory cells
- nerve impulse carried by afferent fibers to facial nerves, then to glossopharyngeal nerves
- glossopharyngeal nerves transmit impulse to thalamus
- thalamus transmits impulse to parietal lobe where impulse interpreted as taste
15
Q
2 nerves involved in taste
A
- facial nerve (info from front 2/3 of tongue)
2. glossopharyngeal (info from back 1/3 of tongue)
