CN 1: Olfactory Nerve

Question 1

What axon type is CN1?

Answer 1

Special sensory nerve

Question 2

What is olfaction?

Answer 2

Conscious chemical sensation for taste and smell

Question 3

What is a special characteristic of olfactory fila that make them prone to fracture?

Answer 3

They are thin so during trauma can be sheared by holes in cribriform plate

Question 4

What are the cells that make up the olfactory tract? Where do they synapse with the receptors?

Answer 4

Mitral cells; in glomeruli just above the cribriform plate

Question 5

What part of the olfactory tract regulates sensitivity to odors?

Answer 5

Anterior olfactory nucleus - send axons to olfactory bulb on other side as well

Question 6

What are the three projections of the olfactory tract?

Answer 6

1. Lateral Olfactory Stria
   - pyriform area (processing of smell)
2. Intermediate stria
   - no function in humans
3. Medial stria
   - subcallosal region; emotional response to smell

Question 7

When you smell apple pie and think thanksgiving, what part of the olfactory tract is being used?

Answer 7

Medial olfactory stria

Question 8

When you’ve been in a room with a consistent odor, what part of the brain helps turn off that smell?

Answer 8

Anterior olfactory nucleus

Question 9

T/F: The olfactory nerve goes through the thalamus?

Answer 9

FALSE

However, it can indirectly send information to the thalamus and many other parts of the brain