Trochlear nucleus

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Trochlear nucleus
Outline of the nucleus raphes dorsalis:
DRif interfascicular subnucleus,
DRv ventral subnucleus
DRvl ventrolateral subnucleus
DRd dorsal subnucleus
mlf medial longitudinal fasciculus
Aq cerebral aqueduct
IVn trochlear nucleus.
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (Trochlear is "IV")
Latin nucleus nervi trochlearis
MeSH 12582022
NeuroNames hier-504
NeuroLex ID Trochlear nucleus
TA A14.1.06.319
FMA 54518
Anatomical terms of neuroanatomy

The nucleus of the trochlear nerve is located in the lower midbrain, at the level of the inferior colliculus. It is a motor nucleus, so is located near the midline. The oculomotor nerve and trochlear nerve are the only two cranial nerves with nucleus in the midbrain.

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 trochlear nerve then goes around the midbrain, and is visible coming out of the sides.

See also[edit]

Additional images[edit]

External links[edit]

  • Atlas image: n2a4p4 at the University of Michigan Health System - "Brainstem, Cranial Nerve Nuclei, Sagittal Section, Medial View"