Neuroanatomy of Cranial Nerves Flashcards Preview

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Flashcards in Neuroanatomy of Cranial Nerves Deck (23)
1

Which is the only cranial nerve to exit the brain posteriorly?

Trochlear (CN IV)

2

Which is the only sensory nerve that does not synapse in the thalamus prior to reaching the cortex?

Olfactory

3

Where are the cell bodies of the olfactory receptor organs located?

In the olfactory organ (In the nasal mucosa)

4

What bony structure do the olfactory nerve fibres pass through?

The cribriform plate of the ethmoid bone

5

Where do the fibres of the olfactory nerve synapse?

In the olfactory bulb.

6

After the olfactory nerves have synapsed in the olfactory bulb what happens?

Second order neurones form the olfactory tract. This then terminates in the piriform cortex of the anterior part of the temporal lobe.

7

Name the two occulomotor nerve nuclei

- Somatic motor nucleus of the occulomotor nerve.
- The visceral motor (parasympathetic) accessory/edinger westphal nucleus of the occulomotor nerve

8

What are the two distinct functions of the occulomotor nerve?

1. Somatic motor (movement of 4 extra occular muscles)
2. Parasympathetic (through the ciliary ganglion to the sphincter pupillae to cause pupil constriction)

9

Which part of the occulomotor nerve is associated with the edinger westphal nucleus?

Parasympathetic

10

Which part of the occulomotor nerve is associated with the occulomotor nucleus?

Somatic motor

11

What part of the brain does the occulomotor nerve arise from?

Midbrain

12

Through what structure does the occulomotor nerve leave the cranial cavity?

Superior orbital fissure

13

Where is the trochlear nerve nucleus is relation to the occulomotor nucleus?

Immediately inferior

14

Where does the trochlear nerve exit the cranial cavity?

Superior orbital fissure

15

Which nerve has the longest intracranial course?

Trochlear

16

Where is the abducens nerve nucleus?

Pons

17

Where does the spinal accessory nerve arise from>

The cervical spinal cord

18

What nucleus of the trigeminal nerve receives proprioceptive information from the muscles of mastication?

Mesencephalic nucleus

19

How many trigeminal nerve nuclei are there?

4

20

How many trigeminal nerve sensory nuclei are there? Name them

3.
Mesencephalic nucleus
Pontine trigeminal nucleus (prinicipal nucleus)
Spinal nucleus

21

What nucleus of the trigeminal nerve receives proprioceptive information about discriminitive touch and vibration?

Pontine/principal nucleus

22

What nucleus of the trigeminal nerve receives proprioceptive information about pain and temperature?

Spinal nucleus

23

What is the afferent and efferent nerves in the jaw jerk reflex and their nuclei?

Both trigeminal
Afferent: Mesencephalic nucleus
Efferent: Trigeminal motor nucleus