CN III Oculomotor Flashcards Preview

PNS > CN III Oculomotor > Flashcards

Flashcards in CN III Oculomotor Deck (21):
1

The oculomotor nerve is a true peripheral nerve containing what two components?

Neurolemma and medullary sheath

2

Where is the nucleus of origin located?

On the ventral side of the cerebral aqueduct near the third ventricle in the midbrain

3

The nucleus of the oculomotor nerve has how many somatic nuclei?

Five

4

The 6th nucleus for the parasympathetic efferent nerve is called what?

Edinger-Westphal nucleus or accessory oculomotor

5

List the sections that fibers from the nucleus of the oculomotor nerve and Edinger-Westphal nucleus pass through

Tegmentum
Red Nucleus
Medial part of substantia nigra
Interpeduncular sulcus

6

The interpeduncular sulcus is just medial to what?

Cerebral peduncle

7

The oculomotor passes forward through the CSF of what cistern?

Interpeduncular cistern

8

The oculomotor nerve passes through the lateral wall of what sinus?

Cavernous sinus

9

After the cavernous sinus, where does the oculomotor nerve travel to?

Superior orbital fissure

10

In the common tendinous ring of the orbit, the oculomotor nerve splits into what two divisions?

Superior and Inferior ramus

11

What are the two nerves of the superior ramus?

Nerve for:
Levator palpebrae superioris
Superior orbital rectus

12

What are the three nerves of the inferior rams?

Nerve for:
Inferior rectus
Medial orbital rectus
Inferior oblique

13

Which nerve from the inferior ramus carries parasympathetic fibers?

Inferior oblique

14

Which ganglion do preganglionic parasympathetic fibers synapse in?

Ciliary ganglion

15

Where do postganglionic parasympathetic fibers synapse in?

Short ciliary nerve

16

Short ciliary nerve innervates what?

Ciliary body
Constrictor pupillae

17

In the lateral wall of the cavernous sinus, oculomotor communicate with what two structures?

Ophthalmic nerve
Internal carotid plexus

18

Proprioceptive fibers from the 5 extrinsic eye muscles

Ophthalmic nerve

19

Sympathetic efferent (vasomotor) nerves

Internal carotid plexus

20

Where is the cortical center for the oculomotor nerve?

Superior frontal gyrus
Brodmann #8

21

Oculomotor controls conjugate eye movement with what two nerves?

Trochlear and abducens