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Cranial Nerves
Where do they leave the brainstem
12
Business
12th Grade
03/05/2012

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Term
CN I
Definition
exits skull thru cribiform plate in ethmoid bone
Term
CN II
Definition
Enters CNS at optic tract, just below the thalamus in the midbrain
Term
CN III
Definition
Exit ventral surface of brainstem between the cerebral peduncles
Term
CN IV
Definition
Only CN to exit brainstem on Dorsal aspect in midbrain, below the superior and inferior colliculus
Term
CN V
Definition
Exit at midlateral surface of pons
Term
CN VI
Definition
Originates in ventral pons and exits the brain at the junction of the pons and the pyramid of medulla
Term
CN VII
Definition
Midventral pons and medullary junction
Term
CN VIII
Definition
enters brainstem ateral to the junction of the pons and medulla, and ends in the nuclear complex in the floor of the 4th ventricle
Term
CN IX
Definition
Most superior exit between olive and inferior cerebellar peduncle near cerebellopontine angle
Term
CN X
Definition
caudal to rootlets of above CN, between olive and inferior cerebellar peduncle
Term
CN XI
Definition
Most inferior CN and exits between olive and inferior cerebellar peduncle
Term
CN XII
Definition
exits medulla between the olive and the pyramid
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