Test 2: Smell and Taste Paths Flashcards Preview

Neuro Anatomy > Test 2: Smell and Taste Paths > Flashcards

Flashcards in Test 2: Smell and Taste Paths Deck (27):
1

What CNs contribute to taste and smell

CN1 olfactory: smell
CNVII facial, IX glossophary, and X vagal: taste/gustation

2

How many neurons make up olfaction path

2 neuron circtui with 5 destinations

3

What are 1neuron characteristics of olfaction

bipolar unmyelinated chemosensitive
-embedded in mucosa of nasal epithelium
-intertwine as fascicle to form olfactory nerve
-project through ethmoid bone to olfactory bulb

4

What are 2neuron characteristics of olfaction

in olfactory bulb
mitral and trufted cells within glomeruli
-go to 5 different targets

5

Why is smell vulnerable to injury?

fascicles going through cribiform plate vulnerable to shear forces from head injury
-result in anosmia

6

What makes up the olfactory nerve

single dendrite with unmyelinatef axon
-cilia hairs
-primary olfactory neyurons
-CB in olfactory epithelium

7

What is in the glomeruli

dendrites and matrial/tufted cells (2neurons)
-each neuron cilia 1 picks up one oderant and translates into bulb

8

What are the 5 targets of 2neurons of olfaction

anterior olfactor nucleus
olfactory tubercle
amygdala
piriform cortex
entorhinal

9

What occurs at the anterior olfactory nucleus

sharpen sensory detection
-contralateral anterior olfactory nucleus and bulb input
-coordinates between bulbs

10

What occurs at the olfactory tubercle

visceral and metabolic responses to smell
-hypothalamus, lateral stria-perforated substence-frontal-hypo

11

What occurs at the amygdala

emotional response to smell
-limbic system- lateral to uncus in temporal lobe

12

What occurs in the piriform cortex

concious perception- PRIMARY olfactory cortex
-orbital frontal gyri; anterior to parahippacampus- uncus

13

What occurs in the entorhinal

memories and forming new ones
-hippocampus- primary gateway

14

Where does the olfactory tract relay to?

Allocortex (

15

What is the area where the2neurons deccusate called

anterior commisure
-medial striate through here

16

Where do higher order smells get translated

primary olfactory output -> orbitofrontal cortex for high order analysis
-orbitofrontal crosses with taste modalitis to get smell

17

How is taste transduced?

By gustatory receptors clustered in tastebuds
-trasnduce sweet, sour, salty, bitter, and umami
-excite pseudounipolar sensory 1neurons for that specific taste

18

What portions of the mouth do the 3 CN involved in taste transduce?

Facial (VII)- aka corda tempony- intermediate facial
-anterior 2/3 tongue
-1CB genicular ganglion

Glossopharyngeal (IX)
-posterior 1/3 tongue and pharynx
-1CB inferior pharyngeal ganglia

Vagus (X)
-larynx, epilottis
-1CB inferior vagal ganglia

19

What are taste receptor cells

saliva will come and bring taste cells throughout mouth down into trenches where taste buds are

20

What are the 3 type of taste buds and where are they

Circumvallae papilae: IX BITTER
-big posterior
-50% all tastebuds
Foliate papilae: IX SOUR
-deep latearl
-25% all tastebuds
Fungiform papilae: VII SWEET/UMAMI/SALTY
-front
-25% all tastebuds

21

What is 1CB of taste

genicu gang for facial
inferior gang for glosso and vagal

22

Where does 1neuron go and where does synapse on 2CB for taste

Travel in solitary tract to solitary nucleus in medulla

23

Where are 2CB for taste

ROSTRAL Solitary nuclues -rostral medulla

24

Where do 2CB go for taste

travel ipsilaterally in central tegmentum path to VPM

25

Where are 3CB of taste

VPM
travel to primary gustatory cortex (insula) or orbital frontal operculum
-via internal capsule and coronar radiate

26

What is the difference in proccessing of primary gustatory cortex vs, orbital frontal gyrus

Primary: discriminative taste
Operc: enhance descrimination with smell

27

Where is the solitary tract/nucleus for taste

ROSTRAL medulla
-caudal is visceral sensory
-nucleus is on outside of tract