olfaction

Question 1

• Bundles of unmyelinated axons from the bipolar olfactory cells pass through the olfactory foramina in the cribiform plate of the ethmoid.
• These bundles are collectively referred to as the __ __

Answer 1

olfactory nerve (CN I)

Question 2

Synapse in the olfactory bulb

Axons of the 2nd order neurons in the olfactory bulbs extend posteriorly as olfactory tracts.

Project to part of the limbic system in the temporal lobe.
Conscious awareness of scents begins.
Fibers project to the frontal lobe and thalamus

Answer 2

pathway

Question 3

Largest type
Located in an inverted “V” in the back of the tongue

Question 4

Look like mushrooms
Scattered over the entire surface of the tongue.

Answer 4

Fungiform papillae

Question 5

No taste buds
Used for manipulating food when chewing or licking.
Well developed in cats and make their tongues feel rough

Question 6

Bitter

Answer 6

CN iX

Question 7

salt & sweet

Answer 7

CN VII

Question 8

serves the anterior 2/3 of tongue.

Answer 8

CN VII (Facial)

Question 9

serves the posterior 1/3 of tongue.

Answer 9

CN IX (Glossopharyngeal)

Question 10

serves the throat and epiglottis.

Question 11

Impulses from the cranial nerves carrying taste fibers, synapse in the medulla oblongata.
Taste fibers project to the:
Limbic system
Hypothalamus
Thalamus
Primary gustatory area in the parietal lobe of cerebral cortex.

Question 12

The olfactory nerves synapse with 2nd order neurons in the ____________.
Olfactory and taste receptors are ___________ neurons with their dendrites lying in watery secretions.
Taste buds consist of _______________, ____________________ and _______________.
The largest type of papilla that taste buds are found on is the ________________.
Cranial nerve IX transmits mainly _________ (taste) from the posterior 2/3 of the tongue.

Answer 12

olfactory bulbs

bipolar

supporting cells,Gustatory receptor cells, and basal cells

Circumvallate

bitter

Question 13

10,000 taste buds on tongue
Taste buds are also found on:
Soft palate
Larynx
Pharynx
Each taste bud consists of three types of cells:
Gustatory (taste) receptor cells (50/bud)
Supporting cells form a capsule for the receptors
Basal cells produce more receptor cells which only have a life span of about 10 days.