Cranial Nerve 3. Flashcards

1
Q

What is the name for cranial nerve 3?

A

Oculomotor

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2
Q

Is Cranial nerve 3 sensory, motor, or mixed?

A

Motor

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3
Q

What are the 2 extra ocular that C.N.3 does not supply?

A

Lateral Rectus

Superior Obloque

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4
Q

What is the C.N. that supplies the lateral rectus?

A

6

Abducens

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5
Q

What is the Cranial Nerve that supplies the Superior Oblique

A

4

Trochlea

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6
Q

What types of fibers does C.N.3 carry?

A

Somatic and parasympathetic

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7
Q

What does C.N.3 have: nuclei of origin, nuclei of termination, or both?

A

Nuclei of origin

Motor

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8
Q

What is the name of the somatic nuclei of origin?

A

Oculomotor nuclei

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9
Q

Where is the somatic nuclei of origin located?

A

In periaquductal gray matter
Anterior to cerebral aqueduct
At the level of superior colluculi

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10
Q

What part of the cerebral cortex sends axons TO the somati nuclei of origin?

A

BRDMN Area 8

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11
Q

Besides the cerebral cortex what else sends fibers to the somatic nuclei of origin?

A
  1. Sup. Colliculus

2. Medial longitudinal fascicles

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12
Q

Axons sent from the oculomotor nuclei travel anteriorly toward what structure?

A

Red nucleus

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13
Q

Oculomotor nuclei fibers exit the CNS in what structure?

A

Interpeduncular fossa

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14
Q

What the nerve leaves the CNS what is it covered by?

A

Epineurium

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15
Q

When the nerve leaves the CNS thru the fossa where do they travel to next?

A
  1. penetrate the dura mater
  2. travel along the cavernous sinus
  3. exit the skull thru Sup. Orbital fissure
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16
Q

When the nerve enter the eye socket what happens to it?

A

Splits into

  1. Superior Rami
  2. Inferior Rami
17
Q

What are the muscles supplied by the Sup. Ramus

A
  1. Inf. Aspect of the Sup. Rectus

2. Levator Palpebrae Superioris

18
Q

What the divisions of the inferior ramus and what does that division supply?

A

Medial: Medial Rectus
Central: Inferior rectus
Lateral: Inferior Oblique

19
Q

What is the nucleus that contains preganglionic Parasympathetic fibers?

A

Acssessory oculomotor nucleus

20
Q

Axons from the accessory oculomotor nucleus follow oculomotor nerve and synapse where?

A

Ciliary ganglion

21
Q

True or False

The ciliary ganglion is located anterior to the eyeball

A

False
Posterior
Silly how can something be anterior to your eyeball…it would look really weird🤣

22
Q

Where is the ciliary ganglion located?

A

Posterior to eyeball about 1cm ant. to the superior original fissure

23
Q

Postganglionic Parasympathetic axons follows what structures?

A

Ciliary arteries

24
Q

What is the pathway for Postganglionic Parasympathetic fibers?

A

Follow ciliary arteries, pierce sclera, and travel along internal surface of sclera

25
What do the Postganglionic Parasympathetic fibers supply?
1. Ciliaris | 2. pupillary constricted/sphincter pupilae
26
What is the job of the ciliaris?
To make the lens more complex
27
True or False | Nerves leaving the ciliary ganglion also carry sympathetic and somatic sensory fibers
True
28
Sympathetic and somatic sensory fibers from ciliary ganglion are picked up by what nerve?
Ophthalmic nerve (V1)
29
True or a False | Sympathetic and somatic sensory fibers synapse with the ciliary ganglion
False | Pass thru Ciliary ganglion WITHOUT synapsing