Trochlear nucleus

Trochlear nucleus
Brain: Trochlear nucleus
Drn.png
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.
Gray696.png
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
NeuroLex ID birnlex_1488

The nucleus of the trochlear nerve is located in the midbrain, at the level of the inferior colliculus. It is a motor nucleus, so is 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.

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

v · d · eHuman brain: mesencephalon (midbrain) (TA A14.1.06, GA 9.800)
Tectum
(Dorsal)
Surface
White: Sensory/ascending
White: Motor/descending
Peduncle
(Ventral)
White: Sensory/ascending
lemnisci (Medial, Lateral) · Ascending MLF (Vestibulo-oculomotor fibers) · Spinothalamic tract · Anterior trigeminothalamic tract · Dentatothalamic tract
White: Motor/descending
Grey: other
Base
White: Motor/descending
Surface

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)
v · d · eNerves of head and neck: the cranial nerves and nuclei (TA A14.2.01, GA 9.855)
olfactory (AON->I)
optic (LGN->II)
oculomotor
(ON, EWN->III)
trochlear (TN->IV)
no significant branches
trigeminal
(PSN, TSN, MN, TMN->V)
abducens (AN->VI)
no significant branches
facial (FMN, SN, SSN->VII)
near origin
vestibulocochlear
(VN, CN->VIII)
glossopharyngeal
(NA, ISN, SN->IX)
ganglia (superior, inferior)
vagus
(NA, DNVN, SN->X)
ganglia (superior, inferior)
accessory (NA, SAN->XI)
hypoglossal (HN->XII)

M: PNS

anat(h/r/t/c/b/l/s/a)/phys(r)/devp/prot/nttr/nttm/ntrp

noco/auto/cong/tumr, sysi/epon, injr

proc, drug(N1B)

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Look at other dictionaries:

  • trochlear nucleus — n a nucleus situated behind the oculomotor nucleus on the dorsal surface of a medial longitudinal fasciculus near the midline that is the source of the motor fibers of the trochlear nerve * * * nucleus of trochlear nerve n. nervi trochlearis …   Medical dictionary

  • Trochlear nerve — Nerve: Trochlear nerve Path of the Trochlear nerve …   Wikipedia

  • nucleus nervi trochlearis — [TA] nucleus of trochlear nerve: the nucleus of origin of the motor fibers of the trochlear nerve; it lies in the central gray matter on the dorsal surface of the medial longitudinal fasciculus in the lower part of the mesencephalon. Called also… …   Medical dictionary

  • Nucleus — 1) In cell biology, the structure that houses the chromosomes. 2) In neuroanatomy, a group of nerve cells. * * * 1. In cytology, typically a rounded or oval mass of protoplasm within the cytoplasm of a plant or animal cell; it is surrounded by a… …   Medical dictionary

  • Nucleus ambiguus — Brain: Nucleus ambiguus Transverse section of medulla oblongata below the middle of the olive. ( Nucleus ambiguus labeled at center right.) Gray s subject #187 …   Wikipedia

  • nucleus tegmentalis posterolateralis — [TA] lateroposterior tegmental nucleus: a nucleus of nerve cells in the mesencephalic tegmentum, situated dorsal to the nucleus of the trochlear nerve. Called also laterodorsal tegmental n …   Medical dictionary

  • nucleus parabrachialis lateralis — [TA] lateral parabrachial nucleus: either of a pair of reticular nuclei located symmetrically on the lateral aspect of the superior cerebellar peduncle in the rostral pons, extending to the level of exit of the trochlear nerve …   Medical dictionary

  • Edinger-Westphal nucleus — Brain: Edinger Westphal nucleus Section through superior colliculus (unlabeled) showing path of oculomotor nerve. ( Edinger Westphal nucleus is not on diagram, but would be near oculomotor nuclei.) …   Wikipedia

  • Cranial nerve nucleus — Brain: Cranial nerve nucleus The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (The olfactory and optic centers are not represented.) Latin nucleus nervi cranialis Gray s …   Wikipedia

  • Oculomotor nucleus — Brain: Oculomotor nucleus Section through superior colliculus showing path of oculomotor nerve …   Wikipedia

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