Trochlear nucleus

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Brain: Trochlear nucleus
Outline of the nucleus raphe dorsalis:
DRif interfascicular subnucleus,
DRv ventral subnucleus
DRvl ventrolateral subnucleus
DRd dorsal subnucleus
mlf medial longitudinal fasciculus
Aq cerebral aqueduct
IVn trochlear nucleus.
Gray696.png
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (Trochlear is "IV")
Latin nucleus nervi trochlearis
Gray's subject #188 807
NeuroNames hier-504
MeSH n_11

The nucleus of the trochlear nerve is located in the midbrain, at the level of the inferior colliculus. It is a motor nucleus, so located near the midline.

Oddly, fibers from the trochlear nucleus cross over in the midbrain at the superior medullary velum and exit posteriorly, (this is the only cranial nerve to do so). The nerve then goes around the midbrain, and is visible coming out the sides.

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