Cranial Nerve 3. Flashcards
What is the name for cranial nerve 3?
Oculomotor
Is Cranial nerve 3 sensory, motor, or mixed?
Motor
What are the 2 extra ocular that C.N.3 does not supply?
Lateral Rectus
Superior Obloque
What is the C.N. that supplies the lateral rectus?
6
Abducens
What is the Cranial Nerve that supplies the Superior Oblique
4
Trochlea
What types of fibers does C.N.3 carry?
Somatic and parasympathetic
What does C.N.3 have: nuclei of origin, nuclei of termination, or both?
Nuclei of origin
Motor
What is the name of the somatic nuclei of origin?
Oculomotor nuclei
Where is the somatic nuclei of origin located?
In periaquductal gray matter
Anterior to cerebral aqueduct
At the level of superior colluculi
What part of the cerebral cortex sends axons TO the somati nuclei of origin?
BRDMN Area 8
Besides the cerebral cortex what else sends fibers to the somatic nuclei of origin?
- Sup. Colliculus
2. Medial longitudinal fascicles
Axons sent from the oculomotor nuclei travel anteriorly toward what structure?
Red nucleus
Oculomotor nuclei fibers exit the CNS in what structure?
Interpeduncular fossa
What the nerve leaves the CNS what is it covered by?
Epineurium
When the nerve leaves the CNS thru the fossa where do they travel to next?
- penetrate the dura mater
- travel along the cavernous sinus
- exit the skull thru Sup. Orbital fissure
When the nerve enter the eye socket what happens to it?
Splits into
- Superior Rami
- Inferior Rami
What are the muscles supplied by the Sup. Ramus
- Inf. Aspect of the Sup. Rectus
2. Levator Palpebrae Superioris
What the divisions of the inferior ramus and what does that division supply?
Medial: Medial Rectus
Central: Inferior rectus
Lateral: Inferior Oblique
What is the nucleus that contains preganglionic Parasympathetic fibers?
Acssessory oculomotor nucleus
Axons from the accessory oculomotor nucleus follow oculomotor nerve and synapse where?
Ciliary ganglion
True or False
The ciliary ganglion is located anterior to the eyeball
False
Posterior
Silly how can something be anterior to your eyeball…it would look really weird🤣
Where is the ciliary ganglion located?
Posterior to eyeball about 1cm ant. to the superior original fissure
Postganglionic Parasympathetic axons follows what structures?
Ciliary arteries
What is the pathway for Postganglionic Parasympathetic fibers?
Follow ciliary arteries, pierce sclera, and travel along internal surface of sclera
What do the Postganglionic Parasympathetic fibers supply?
- Ciliaris
2. pupillary constricted/sphincter pupilae
What is the job of the ciliaris?
To make the lens more complex
True or False
Nerves leaving the ciliary ganglion also carry sympathetic and somatic sensory fibers
True
Sympathetic and somatic sensory fibers from ciliary ganglion are picked up by what nerve?
Ophthalmic nerve (V1)
True or a False
Sympathetic and somatic sensory fibers synapse with the ciliary ganglion
False
Pass thru Ciliary ganglion WITHOUT synapsing
