Pathways of the Oculomotor nerve (CN 3)

Question 1

V1 nerve receives sensory innervations from where? Through what?

Answer 1

From the skin around forehead and eyes

Through the superior orbital fissure

Question 2

Cranial nerve 3…

Carries somatic motor fibers through where? To where?

Answer 2

Through the superior orbital fissure 
To...
superior rectus
inferior rectus
medial rectus
inferior oblique

Question 3

Why don’t the somatic motor fibers synapse?

Answer 3

they are SOMATIC motor, not VISCERAL motor!

Question 4

Cranial nerve 3…

Carries parasympathetic preganglionic fibers through where? Where do they synapse? And where do they go?

Answer 4

Through the superior orbital fissure
Synapse in the ciliary ganglion
Postganglionic fibers are carried to...
-constrictor pupillae
-ciliary muscle

Question 5

Cranial nerve 4…

Carries somatic motor fibers through where? To where?

Answer 5

Through the superior orbital fissure

To the superior oblique

Question 6

Cranial nerve 6…

Carries somatic motor fibers through where? To where?

Answer 6

Through the superior orbital fissure

To the lateral rectus

Question 7

Sympathetic preganglionic fibers travel up the sympathetic chain, and synapse where? Then what?

Answer 7

Synapse in the superior cervical ganglion

Postganglionic sympathetic fibers travel along the internal carotid artery and pass through the carotid canal

Question 8

What’s the antagonist of pupillary constrictor?

What is it innervated by?

Answer 8

pupillary dilator

SYMPATHETIC fibers! (postganglionic)

Question 9

Not all muscles have both parasympathetic and sympathetic innervations. What are the sympathetic targets in this area?

Answer 9

Pupillary dilator
Smooth muscle of blood vessels
Smooth muscle of eyelid
Sweat glands