Trochlear Nucleus
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Trochlear Nucleus
Trochlear nucleus
Drn.png
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.
Gray696.png
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (Trochlear is "IV")
Details
Identifiers
Latin nucleus nervi trochlearis
NeuroNames 513
NeuroLex ID birnlex_1488
TA A14.1.06.319
FMA 54518
Anatomical terms of neuroanatomy

The nucleus of the trochlear nerve is located in the midbrain, at an intercollicular level between the superior colliculus and inferior colliculus.[1] It is a motor nucleus, and so is located near the midline, embedded within the medial longitudinal fasciculus (see diagram at right). The oculomotor nerve and trochlear nerve are the only two cranial nerves with nuclei in the midbrain, other than the trigeminal nerve, which has a midbrain nucleus called the mesencephalic nucleus of trigeminal nerve, which functions in preserving dentition.

Oddly, fibers from the trochlear nucleus cross over in the trochlear decussation of the midbrain, located in the superior medullary velum to exit dorsally, 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

References

  1. ^ Baxter, Donald; Olsewski, Jerzy (1982). Cytoarchitecture of the Human Brain Stem (2nd ed.). Basel: S. Karger. pp. 50-51. ISBN 3-8055-2210-X. 

External links

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

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

Trochlear_nucleus
 



 

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