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PNS > CN 1 + 2 > Flashcards

CN 1 + 2 Flashcards

1
Q

Cranial Nerve One

A

olfactory nerve

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2
Q

CN I: sensory or motor?

A

sensory

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3
Q

Where are olfactory neurons located?

A

olfactory epithelium lining superior part of the nasal cavity

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4
Q

Myelination status of olfactory neurons

A

unmyelinated, but cover by Schwann cells

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5
Q

Olfactory nerves pass through which bone to reach the olfactory bulb?

A

cribriform plate of the ethmoid bone

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6
Q

Secondary sensory neurons located in the olfactory bulb

A

mitral cells

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7
Q

Where are mitral cells located?

A

olfactory bulb

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8
Q

Olfactory nerves enter the bulb and synapse on mitral cells. What is the name of this synapse?

A

synaptic glomerulus

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9
Q

Mitral cells relay information _____(posterior or anterior) via the olfactory tract

A

posterior

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10
Q

Where does the olfactory tract split into medial and lateral olfactory striae?

A

anterior perforated substance

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11
Q

At the anterior perforated substance the olfactory splits into which two striae?

A

medial and lateral

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12
Q

What is the path of the medial olfactory striae?

A

cross midline at the anterior commissure and travel to the opposite olfactory bulb

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13
Q

Where do the lateral olfactory striae carry information?

A

primary olfactory cortex; the periamygdaloid and prepiriform area, including uncus(Bdmn 34)

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14
Q

Do we segregate smell?

A

no

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15
Q

Does the olfactory pathway synapse on the thalamus?

A

no

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16
Q

Automatic nerve from nasal septum

A

terminal nerve

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17
Q

Nerve important in tracking prey, poorly developed in humans

A

vomeronasal nerve

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18
Q

Loss of smell

A

anosmia

19
Q

Cranial Nerve Two

A

optic nerve

20
Q

Sensory organ of vision

A

eyes

21
Q

Three tunics of the eye

A

1) fibrous tunic
2) vascular tunic
3) nervous tunic/retina

22
Q

What makes up the fibrous tunic?

A

sclera and cornea

23
Q

What makes up the vascular tunic?

A

ciliary body, iris, and choroid

24
Q

How many layers makes up the nervous tunic/retina?

A

10 layers

25
Q

Name the 10 layers of the nervous tunic/retina

A

1) pigmented layer
2) photosensitive outer segment
3) external limiting membrane
4) outer nuclear layer
5) outer plexiform layer
6) inner nuclear layer
7) inner plexiform layer
8) ganglion layer
9) nerve fiber layer
10) internal limiting membrane

26
Q

In which layer of the nervous tunic/retina does a detached retina occur?

A

pigmented layer

27
Q

Myelination status of the nerve fiber layer of the nervous tunic/retina

A

not myelinated

28
Q

Three types of cones

A

red, green, and blue

29
Q

In which layer of the nervous tunic/retina are the photoreceptors located?

A

outer segment

30
Q

Point of clearest vision

A

fovea centralis

31
Q

What to rod sense?

A

light and dark

32
Q

Where are no rods found?

A

fovea centralis

33
Q

Where is the greatest concentration of rods?

A

periphery of retina

34
Q

Bipolar cell bodies are found in which layer?

A

inner nuclear

35
Q

What layer is the synapse between bipolar cells and ganglion cells found?

A

inner plexiform

36
Q

Are optic nerve axons myelinated?

A

yes (part of CNS)

37
Q

What forms the myelin around the optic nerve axons?

A

interfascicular oligodendrocytes

38
Q

In the optic chiasma fibers from the ____(medial or lateral) side of each retina cross, while _____(medial or lateral) fibers do not.

A

medial; lateral

39
Q

3 nuclei of termination of the optic tract

A

1) lateral geniculate body
2) superior colliculus
3) pretectal nucleus of the midbrain

40
Q

2 muscles influenced by the tectospinal tract

A

sternocleidomastoid and trapezius

41
Q

Signs and symptoms associated with a lesion of the optic nerve

A

loss of vision in one eye and depth perception

42
Q

Signs and symptoms associated with a lesion of the decussating fibers of the optic chiasma

A

tunnel vision (loss of peripheral vision in both eyes)

43
Q

Signs and symptoms associated with a lesion of the optic tract

A

loss of 1/2 of the visual field opposite side of lesion

44
Q

4 visual reflexes

A

1) direct and consensual light reflexes
2) accommodation reflex (near/far)
3) corneal reflex (CN V+VII)
4) convergence (medially turn eyes)

PNS (5 decks)

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