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Encyclopedia > Trochlear nucleus
Brain: Trochlear nucleus
Transverse section of mid-brain at level of inferior colliculi. (Trochlear nucleus is not on diagram, but would be near oculomotor nucleus.)
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (Trochlear is "IV")
Latin '
Gray's subject #188 807
Part of
Components
Artery
Vein
BrainInfo/UW hier-504
MeSH [1]

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. The inferior colliculus is part of the brain that sits below the superior colliculus, above the trochlear nerve and at the base of the projection of the medial geniculate nucleus (MGN) and the lateral geniculate nucleus (LGN). ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... The University of Washington, founded in 1861, is a major public research university in Seattle, Washington. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... In biological anatomy, the mesencephalon (or midbrain) is the middle of three vesicles that arise from the neural tube that forms the brain of developing animals. ... The paired inferior colliculi together with the superior colliculi form the eminences of the corpora quadrigemina. ...


Oddly, fibers from the trochlear nucleus cross over in the midbrain 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

The fourth of twelve cranial nerves, the trochlear nerve controls the function of the superior oblique muscle, which rotates the eye towards the nose and also moves the eye downward. ...

External links


Mesencephalon (midbrain)

cerebral peduncle: midbrain tegmentum (ventral tegmentum), pretectum, substantia nigra, red nucleus, pedunculopontine nucleus, medial longitudinal fasciculus, medial lemniscus, rubrospinal tract, lateral lemniscus In biological anatomy, the mesencephalon (or midbrain) is the middle of three vesicles that arise from the neural tube that forms the brain of developing animals. ... The cerebral peduncle, by most classifications, is everything in the mesencephalon except the tectum. ... The midbrain tegmentum is part of the midbrain extending from the substantia nigra to the cerebral aqueduct. ... Grays FIG. 712– Transverse section of mid-brain at level of superior colliculi. ... Pretectum is a structure located in the midbrain. ... The substantia nigra (Latin for black substance) is a portion of the midbrain thought to be involved in certain aspects of movement and attention. ... The red nucleus is a structure in the rostral midbrain involved in motor coordination. ... The pedunculopontine nucleus (PPN) is located in the brainstem, caudal to the substantia nigra and adjacent to the superior cerebellar peduncle. ... The medial longitudinal fasciculus (MLF) is a group of axons on each side of the brainstem, that carry information about the direction that the eyes should move. ... The medial lemniscus, also known as Reils band or Reils ribbon, is a pathway in the brainstem, that carries sensory information from the gracile and cuneate nuclei to the thalamus. ... The rubrospinal tract is part of the indirect extra-pyramidal tract and is responsible for large muscle movement such as the arms and the legs. ... The lateral lemniscus is a tract of axons in the brainstem that carries information about sound to the inferior colliculus of the midbrain. ...


tectum: corpora quadrigemina, inferior colliculi, superior colliculi The tectum is the dorsal part of the midbrain, derived in embryonic development from the alar plate of the neural tube. ... Corpora quadrigemina (Latin: four twins) is the collective name given to both pairs of the inferior and superior colliculi. ... The paired inferior colliculi together with the superior colliculi form the eminences of the corpora quadrigemina. ... The superior colliculus is part of the brain that sits below the thalamus and surrounds the pineal gland in the mesencephalon of vertebrate brains. ...


cerebral aqueduct: oculomotor nucleus, trochlear nucleus, Edinger-Westphal nucleus The mesencephalic duct, also known as the Aqueduct of Silvius or the cerebral aqueduct, contains cerebrospinal fluid (CSF), is within the mesencephalon (or midbrain) and connects the third ventricle in the thalamus (or diencephalon) to the fourth ventricle, which is between the pons and cerebellum. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... The Edinger-Westphal nucleus is the accessory parasympathetic nucleus of the oculomotor nerve, supplying the constricting muscles of the iris. ...


  Results from FactBites:
 
IX. Neurology. 4e. Composition and Central Connections of the Spinal Nerves. Gray, Henry. 1918. Anatomy of the Human ... (8263 words)
The preganglionic fibers from this nucleus terminate in the otic ganglion; the postganglionic fibers from the otic ganglion pass to the parotid gland.
The descending branches terminate in the dorsal (medial) vestibular nucleus, the principal nucleus of the vestibular nerve.
The axons arise from the nucleus of the oculomotor nerve and pass in bundles through the posterior longitudinal bundle, the tegmentum, the red nucleus and the medial margin of the substantia nigra in a series of curves and finally emerge from the oculomotor sulcus on the medial side of the cerebral peduncle.
Abbreviations (533 words)
IPAC = interstitial nucleus of posterior limb of anterior commissure
IPACL = interstitial nucleus of posterior limb of anterior commissure
RLi = rostral linear nucleus of the raphe
  More results at FactBites »

 
 

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