Unit 2 - Cranial Nerves Of Smell, Vision And Ocular Movement

Question 1

T/F Primary sensory neurons of CN I (olfactory) are BIPOLAR

Answer 1

True

Question 2

Where are olfactory neurons found?

Answer 2

Within olfactory epithelium, covered by thin layer of mucosa, lining the superior aspect of the nasal cavity.

Question 3

How many olfactory nerves come together to form an olfactory bulb?

Answer 3

10-20 olfactory nerves

Question 4

What is the fxn of olfactory “hairs”?

Answer 4

Act as receptors

Question 5

What supports olfactory neurons?

Answer 5

“Supporting cells”

Question 6

What is the name of the group of axons that come together to form the olfactory nerves?

Answer 6

Central Processes

Question 7

After passing thru the cribriform plate and entering the olfactory bulb, where to olfactory neurons synapse and what forms at that synapse?

Answer 7

On the dendrites of mitral cells, where it forms a synaptic glomeruli

Question 8

What covers the outside of the olfactory neuron axon?

Answer 8

Schwann Cells

Question 9

T/F Olfactory neurons are unmyelinated, but covered by Schwann Cells.

Answer 9

True

Question 10

Mitral Cells are (Primary/secondary/tertiary) sensory neurons

Answer 10

Secondary sensory neurons

Question 11

Where are the cell bodies of mitral cells located?

Answer 11

Olfactory Bulbs

Question 12

Mitral cells relay information ______________, via the _____________ tract.

Answer 12

posterior; olfactory

Question 13

What happens to the olfactory tract fibers at the anterior perforated substance?

Answer 13

Splits into medial and lateral striae

Question 14

What type of olfactory fibers cross the midline via the anterior commissure and travel to the opposite olfactory bulb?

Answer 14

Medial striae fibers

Question 15

What type of olfactory fibers carry info to the primary olfactory cortex, periamygdaloid and peripiriform area (including the uncus - Brodman Area 34) on the medial aspect of the temporal lobe?

Answer 15

Lateral Striae fibers

Question 16

What makes up the PRIMARY olfactory cortex?

Answer 16

Periamygdaloid and peripiriform area, including UNCUS (B.A.34)

Question 17

What makes up the SECONDARY olfactory cortex?

Answer 17

Entorhinal area (in parahippocampal gyrus - B.A. 28)

Question 18

Damage of the olfactory nerve fibers: clinical considerations

Answer 18

1) Loss of smell
2) Skull fracture
3) CSF leakage

Question 19

How many layers is the eye composed of?

Answer 19

3

1) fibrous tunic
2) vascular tunic
3) retina (made of 10 layers)

Question 20

What is the first layer of the eye called, and what does it consist of?

Answer 20

Fibrous tunic

* Consists of: ____________________ and ____________________

Question 21

What is the middle layer of the eye called? What does it consist of?

Answer 21

Vascular tunic

* Consists of: _______________, ______________, and __________________

Question 22

What is the Inner Layer of the eye called? How many layers is it composed of?

Answer 22

Retina, 10

Question 23

What are the 10 layers of the retina?

Answer 23

1) Pigmented layer (adj. to choroid)
2) Photosensitive outer segments (rods and cones)
3) External limiting membrane
4) Outer nuclear layer (rod and cone cell bodies)
5) Outer plexiform layer (where rods and cones synapse with bipolar cells)
6) Inner nuclear layer (bipolar cell bodies)
7) Inner plexiform layer (bipolar cells synapse with ganglion cells)
8) Ganglion Cell layer (ganglion cell bodies)
9) Nerve fiber layer (retinal
10)