Olfactory

Question 1

What is the life span of sensory neurons and how are they replaced?

Answer 1

30-60 days
Replaced from a layer of basal cells in the epithelium.

Question 2

What is the region of the skull that the cilia of the sensory neurons project through?

Answer 2

Cribifrom plate

Question 3

What are the areas in which the sensory and mitral neurons meet?

Answer 3

Glomeruli

Question 4

Where are glomeruli located?

Answer 4

The olfactory bulb in the brain

Question 5

What do the cilia of the sensory neurons do

Answer 5

Project into the mucus of the nasal cavity, where they will recognise odours, and they contain the machinery to amplify the signals and send them to the brain.

Question 6

What superfamily do odourant receptors belong to>

Answer 6

G-protein coupled receptors

Question 7

What is the “one neuron one receptor rule”

Answer 7

Each sensory neuron only expresses one single receptor

Question 8

How are different odours recognised by the brain

Answer 8

The brain will recognise what receptors are stimulated and the pattern of stimulation, this will then be used to determine what the odour is.