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Trochlear nucleus
From Wikipedia, the free encyclopedia
(Redirected from Nucleus of the trochlear nerve)
| Brain: Trochlear nucleus | ||
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| 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. |
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| 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.
 Nuclei of origin of cranial motor nerves schematically represented; lateral view. |
 Primary terminal nuclei of the afferent (sensory) cranial nerves schematically represented; lateral view. |
 Scheme showing central connections of the optic nerves and optic tracts. |
- Atlas of anatomy at UMich n2a4p4 - "Brainstem, Cranial Nerve Nuclei, Sagittal Section, Medial View"
- nucleus+of+trochlear+nerve at eMedicine Dictionary
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| Tectum | Corpora quadrigemina (Inferior colliculi, Superior colliculi) • Subcommissural organ • Pretectum |
| Peduncle tegmentum | Periaqueductal gray (Cerebral aqueduct, Dorsal raphe nucleus) • Ventral tegmentum • Pedunculopontine nucleus • Red nucleus • MLF (riMLF) • lemnisci (Medial, Lateral) • cranial nuclei (III: Oculomotor nucleus, III: Edinger-Westphal nucleus, IV: Trochlear nucleus, V: Mesencephalic) |
| Peduncle base | Substantia nigra • Cerebral crus (Corticospinal tract, Corticobulbar tract, Corticopontine tract/Frontopontine fibers/Temporopontine fibers) |