CN III Oculomotor Flashcards
The oculomotor nerve is a true peripheral nerve containing what two components?
Neurolemma and medullary sheath
Where is the nucleus of origin located?
On the ventral side of the cerebral aqueduct near the third ventricle in the midbrain
The nucleus of the oculomotor nerve has how many somatic nuclei?
Five
The 6th nucleus for the parasympathetic efferent nerve is called what?
Edinger-Westphal nucleus or accessory oculomotor
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
The interpeduncular sulcus is just medial to what?
Cerebral peduncle
The oculomotor passes forward through the CSF of what cistern?
Interpeduncular cistern
The oculomotor nerve passes through the lateral wall of what sinus?
Cavernous sinus
After the cavernous sinus, where does the oculomotor nerve travel to?
Superior orbital fissure
In the common tendinous ring of the orbit, the oculomotor nerve splits into what two divisions?
Superior and Inferior ramus
What are the two nerves of the superior ramus?
Nerve for:
Levator palpebrae superioris
Superior orbital rectus
What are the three nerves of the inferior rams?
Nerve for:
Inferior rectus
Medial orbital rectus
Inferior oblique
Which nerve from the inferior ramus carries parasympathetic fibers?
Inferior oblique
Which ganglion do preganglionic parasympathetic fibers synapse in?
Ciliary ganglion
Where do postganglionic parasympathetic fibers synapse in?
Short ciliary nerve
Short ciliary nerve innervates what?
Ciliary body
Constrictor pupillae
In the lateral wall of the cavernous sinus, oculomotor communicate with what two structures?
Ophthalmic nerve
Internal carotid plexus
Proprioceptive fibers from the 5 extrinsic eye muscles
Ophthalmic nerve
Sympathetic efferent (vasomotor) nerves
Internal carotid plexus
Where is the cortical center for the oculomotor nerve?
Superior frontal gyrus
Brodmann #8
Oculomotor controls conjugate eye movement with what two nerves?
Trochlear and abducens
