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Brainstem and Cranial Nerves: The Midbraina 

Brainstem and Cranial Nerves: The Midbraina
Chapter:
Brainstem and Cranial Nerves: The Midbraina
Source:
Mayo Clinic Neurology Board Review
Author(s):

Kelly D. Flemming

and Paul W. Brazis

DOI:
10.1093/med/9780190214883.003.0010

The midbrain (or mesencephalon) is the uppermost segment of the brainstem. This chapter reviews the important structures in the midbrain, including cranial nerves III and IV. The midbrain extends from the level of the trochlear nucleus to an imaginary line drawn between the mammillary bodies and the posterior commissure. Important structures at this level include the cerebral peduncles, superior and inferior colliculi, the red nucleus, the substantia nigra, decussation of the middle cerebellar peduncle, and cranial nerves III and IV.

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