Trochlear nucleus
| 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") | |
| Details | |
| Identifiers | |
| Latin | nucleus nervi trochlearis |
| MeSH | 12582022 |
| NeuroNames | hier-504 |
| NeuroLex ID | Trochlear nucleus |
| TA | A14.1.06.319 |
| FMA | 54518 |
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
Additional images
Nuclei of origin of cranial motor nerves schematically represented; lateral view.
Scheme showing central connections of the optic nerves and optic tracts.
Brain stem sagittal section
External links
- Atlas image: n2a4p4 at the University of Michigan Health System - "Brainstem, Cranial Nerve Nuclei, Sagittal Section, Medial View"
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