Olfactory Nerve

Question 1

What kind of nerve is the Olfactory Nerve?

Answer 1

SSA - Special Sensory Afferent

Question 2

Where does Olfaction begin?

Answer 2

Olfactory Epithelium

Question 3

Where is the Olfactory Epithelium located?

Answer 3

Roof of the nasal cavity, and extends into the superior nasal conchae and nasal septum

Question 4

What allows scent molecules to by captured and dissolved?

Answer 4

Nasal mucosa keeping the area moist

Question 5

What do olfactory epithelia have in the mucosal layer?

Answer 5

Small ciliary processes

Question 6

What do ciliary r/c transmit?

Answer 6

Sensory input into the bipolar olfactory epithelium

Question 7

Where does sensory information transmit after the bipolar olfactory epithelium?

Answer 7

Though the cribriform plate into the olfactory bulb

Question 8

When does olfactory transduction begin?

Answer 8

Olfactant binding to r/c on ciliary processes

Question 9

What happens when olfactant binds to ciliary processes?

Answer 9

G-protein activation results in inc in intracellular cAMP, creating graded r/c potential

Question 10

What allows for discrimination of up to 10,000 different smells?

Answer 10

Variations in r/c protein coupled with CNS integration.

Question 11

What is the olfactory bulb?

Answer 11

A 5 layered area at the rostral enlargement of the olfactory tract

Question 12

How are the olfactory tracts related to embryonic development?

Answer 12

The olfactory tracts are telencephalic outpouchings

Question 13

What does the olfactory area house?

Answer 13

second order neurons

Question 14

Where do nerve fibers project?

Answer 14

From the mucosal layer to the 2nd layer of the bulb

Question 15

What is the 2nd layer of the olfactory bulb called?

Answer 15

The Glomerular layer

Question 16

What are Glomerular neurons?

Answer 16

Interneurons between the ascending neuroepithelial nerve fibers from layer 1 and the descending fibers from the mitral cells in layer 4

Question 17

What do Glomerular neurons also integrate with?

Answer 17

Tufted cells from layer 3.

Question 18

What is the 3rd layer of the olfactory bulb called?

Answer 18

External Plexiform Layer

Question 19

What interneuron cell group is in the 5th layer of the olfactory bulb?

Answer 19

Granular cells

Question 20

Describe the 5 layers of the Olfactory Bulb

Answer 20

1. Nerve Fiber Layer
2. Glomerular Layer
3. Tufted Cell Layer
4. Mitral Cell Layer
5. Granule Cell Layer

Question 21

What composes the olfactory tract?

Answer 21

The projections of the mitral and tufted cell layers

Question 22

What does the olfactory tract divide into?

Answer 22

Medial and Lateral Olfactory Stria

Question 23

Where is the division of the olfactory tract?

Answer 23

In the olfactory trigone, anterior to the perforated substance

Question 24

Which division carries the majority of olfactory information.

Answer 24

Lateral Stria

Question 25

Where does the Lateral Stria take information to?

Answer 25

Lateral Primary Olfactory Area

Question 26

What does the olfactory area consist of?

Answer 26

Uncut Entorhinal area Insula Amygdaloid Body

Question 27

Where does the medial olfactory stria project to?

Answer 27

Medial olfactory area

Question 28

Where is the medial olfactory area located?

Answer 28

Medial surface of the frontal lobe

Question 29

What functional system is the medial surface of the frontal closely associated with?

Answer 29

Limbic System

Question 30

What is the Primary Olfactory Cx also known as?

Answer 30

Piriform and Periamygdaloid Cx