1: Unit II CN I

Question 1

What type of neurons are olfactory neurons?

Answer 1

Bipolar sensory

Question 2

Where are olfactory neurons found?

Answer 2

In olfactory epithelium lining the superior part of the nasal cavity

Question 3

What covers the olfactory epithelium?

Answer 3

A thin layer of mucus

Question 4

How are olfactory neurons supported?

Answer 4

Via “supporting cells”

Olfactory hairs function as receptors

Question 5

How do olfactory central processes (axons) work?

Answer 5

Collect 10-20 olfactory nerves, convey info to olfactory bulbs

Question 6

Are olfactory neurons myelinated or unmyelinated?

Answer 6

Unmyelinated

Question 7

What are olfactory neurons covered in?

Answer 7

Schwann cells

Question 8

Where do olfactory neurons pass?

Answer 8

Through crib reform plate (ethmoid bone)

Question 9

As olfactory neurons enter the olfactory bulb, what do they synapse on?

Answer 9

Dendrites of mitral cells

Question 10

What are formed at the synapses between olfactory neurons and mitral cells?

Answer 10

Synaptic glomeruli

Question 11

What is another name for olfactory nerves?

Answer 11

Fila olfactoria

Question 12

What are mitral cells considered?

Answer 12

Secondary sensory neurons

Question 13

Where are mitral cell bodies located?

Answer 13

Olfactory bulb

Question 14

Where do mitral cells relay information to?

Answer 14

Posterior to the olfactory tract

Question 15

Where do the olfactory tract fibers split into medial and lateral olfactory striae?

Answer 15

Anterior perforated substance

Question 16

How do medial stria fibers travel?

Answer 16

Cross midline in anterior commissure and travel to the opposite olfactory bulb

Question 17

Where do lateral stria fibers carry info to?

Answer 17

Primary olfactory cortex: periamygdaloid and prepiriform area, including uncus (BMA 34) on medial aspect of temporal lobe

Sencondary: enterohinal area BMA 28

Question 18

What are 2 major points about how the olfactory neurons function?

Answer 18

1: crossing ensures that the olfactory cortex on each side from both bulbs
2: smell is not segregated

Question 19

Describe the olfactory pathway:

Answer 19

2 neurons receptor to cortex

Thalamus NOT in pathway

Question 20

What is a anosmia?

Answer 20

In ability to smell (born that way or skull fracture)

Test both nostrils

Question 21

What can CSF leakage mimick

Answer 21

A cold w/o symptoms

Thinner than snot and HALO sign

Question 22

What is the terminal nerve?

Answer 22

In nasal septum, autonomic function

Question 23

What are the primary sensory neurons of CN I (olfactory) called?

Answer 23

Olfactory neurons