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| Name = Trochlear nucleus |
| Name = Trochlear nucleus |
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| Latin = nucleus nervi trochlearis |
| Latin = nucleus nervi trochlearis |
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| GraySubject = 188 |
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| GrayPage = 807 |
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| Image = Drn.png |
| Image = Drn.png |
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| Caption = Outline of the [[nucleus raphes dorsalis]]:<br>'''DRif''' interfascicular subnucleus,<br>'''DRv''' ventral subnucleus<br>'''DRvl''' ventrolateral subnucleus<br>'''DRd''' dorsal subnucleus<br>'''mlf''' [[medial longitudinal fasciculus]]<br>'''Aq''' [[cerebral aqueduct]]<br>'''IVn''' trochlear nucleus. |
| Caption = Outline of the [[nucleus raphes dorsalis]]:<br>'''DRif''' interfascicular subnucleus,<br>'''DRv''' ventral subnucleus<br>'''DRvl''' ventrolateral subnucleus<br>'''DRd''' dorsal subnucleus<br>'''mlf''' [[medial longitudinal fasciculus]]<br>'''Aq''' [[cerebral aqueduct]]<br>'''IVn''' trochlear nucleus. |
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| BrainInfoType = hier |
| BrainInfoType = hier |
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| BrainInfoNumber = 504 |
| BrainInfoNumber = 504 |
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| MeshName = |
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| MeshNumber = |
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| NeuroLex = Trochlear nucleus |
| NeuroLex = Trochlear nucleus |
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| NeuroLexID = birnlex_1488 |
| NeuroLexID = birnlex_1488 |
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| Trochlear nucleus | |
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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")
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| Details | |
| Identifiers | |
| Latin | nucleus nervi trochlearis |
| NeuroNames | 513 |
| NeuroLexID | birnlex_1488 |
| TA98 | A14.1.06.319 |
| TA2 | 5890 |
| FMA | 54518 |
| Anatomical terms of neuroanatomy | |
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Find sources: "Trochlear nucleus" – news · newspapers · books · scholar · JSTOR (June 2015) (Learn how and when to remove this message) |
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.
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Anatomy of the midbrain
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| Tectum (Dorsal) |
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| CSF |
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| Peduncle (Ventral) |
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The cranial nerves
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| Terminal (CN 0) |
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| Olfactory (CN I) |
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| Optic (CN II) |
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| Oculomotor (CN III) |
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| Trochlear (CN IV) |
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| Trigeminal (CN V) |
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| Abducens (CN VI) |
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| Facial (CN VII) |
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| Vestibulocochlear (CN VIII) |
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| Glossopharyngeal (CN IX) |
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| Vagus (CN X) |
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| Accessory (CN XI) |
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| Hypoglossal (CN XII) |
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