olfactory

Question 0

Axons from olfactory receptors are among the _____ and _____

Answer 0

thinnest and slowest

Question 1

Describe an olfactory receptor

Answer 1

A small bipolar neuron
Dendrite ends in olfactory vesicle, from which 10-30 cilia spread over the surface in a layer of mucus secreted by Bowman’s glands
Stimulate chemosensitive cilia
Unusual among human neurons-replaced throughout life, 1-2m life

Question 2

Axons from olfactory receptors collect into a series of bundles (only about 20) called ___________, pass through holes in __________ of ethmoid bone

Answer 2

olfactory fila

cribiform plate

Question 3

olfactory receptor axons end in

Answer 3

olfactory bulb

Question 4

olfactory fila make up

Answer 4

cranial nerve I

Question 5

taste and smell:

Answer 5

conscious chemical sensation

Question 6

olfaction:

Answer 6

detects volatile chemicals (odorants) drawn into nasal cavity

Question 7

humans can detect about ________ different odors

Answer 7

10,000

Question 8

peripheral origin of olfactory system

Answer 8

olfactory epithelium

Question 9

Patch in roof of nasal cavity, bilateral

Contains 3 million receptor cells, supporting cells, bowman’s gland ducts, sensory endings from CN V (irritants)

Answer 9

Olfactory epithelium

Question 10

_________ develops as an outgrowth of telencephalon

Answer 10

olfactory bulb

Question 11

Olfactory bulb and tracts reaches

Answer 11

ipsilateral hemisphere with no relay in thalamus

Question 12

olfactory fibers sort in

Answer 12

bulb

Question 13

each type of olfactory receptor sends an axon to one _________ of a mitral cell even though these cells are intermingled in the olfactory epithelium

Answer 13

glomerulus

Question 14

olfactory bulbs project to

Answer 14

olfactory cortex

Question 15

axons of mitral and ______ cells in tract

Answer 15

tufted

Question 16

Collaterals to anterior olfactory nucleus

Answer 16

thought to regulate sensitivity of olfactory bulb

Question 17

fibers project to both bulbs

Answer 17

cross midline in anterior commissure

Question 18

some fibers in tract end in

Answer 18

olfactory tubercle

Question 19

most fibers turn laterally and end in

Answer 19

lateral olfactory pathway

Question 20

olfactory bulb projections end in two general areas

Answer 20

primary olfactory cortex

amygdala

Question 21

primary olfactory cortex consists of

Answer 21

cortex near lateral olfactory tract, aka piriform cortex
cortex covers amygdala, periamygdaloid cortex
small part of hippocampal gyrus

Question 22

olfactory information sent to

Answer 22

hypothalamus, thalamus, hippocampus, orbital cortex, amygdala

Question 23

olfactory association cortex

Answer 23

orbital surface of frontal lobe and anterior insula