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Encyclopedia > Oculomotor nucleus
Brain: Oculomotor nucleus
Section through superior colliculus showing path of oculomotor nerve.
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (Oculomotor is "III")
Latin '
Gray's subject #188 807
Part of
Components
Artery
Vein
Acronym(s) {{{Acronym}}}
NeuroNames hier-483
MeSH [1]
Dorlands/Elsevier {{{DorlandsPre}}}/{{{DorlandsSuf}}}

The fibers of the oculomotor nerve arise from a nucleus in the midbrain, which lies in the gray substance of the floor of the cerebral aqueduct and extends in front of the aqueduct for a short distance into the floor of the third ventricle. From this nucleus the fibers pass forward through the tegmentum, the red nucleus, and the medial part of the substantia nigra, forming a series of curves with a lateral convexity, and emerge from the oculomotor sulcus on the medial side of the cerebral peduncle. Image File history File links Cn3nucleus. ... The superior colliculus is part of the brain that sits below the thalamus and surrounds the pineal gland in the mesencephalon of vertebrate brains. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... Image File history File links Gray696. ... Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... NeuroNames is a system of nomenclature for the brain and related structures. ... 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. ... Elseviers logo Elsevier, the worlds largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... 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 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 third ventricle is one of the four connected fluid-filled cavities within the human brain. ... The midbrain tegmentum is part of the midbrain extending from the substantia nigra to the cerebral aqueduct. ... The red nucleus is a structure in the rostral midbrain involved in motor coordination. ... 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 cerebral peduncle, by most classifications, is everything in the mesencephalon except the tectum. ...


The nucleus of the oculomotor nerve does not consist of a continuous column of cells, but is broken up into a number of smaller nuclei, which are arranged in two groups, anterior and posterior. Those of the posterior group are six in number, five of which are symmetrical on the two sides of the middle line, while the sixth is centrally placed and is common to the nerves of both sides. The anterior group consists of two nuclei, an antero-medial and an antero-lateral .


The nucleus of the oculomotor nerve, considered from a physiological standpoint, can be subdivided into several smaller groups of cells, each group controlling a particular muscle.


A nearby nucleus, the Edinger-Westphal nucleus, is responsible for the autonomic functions of the oculomotor nerve, including pupillary constriction and lens accommodation. The Edinger-Westphal nucleus is the accessory parasympathetic nucleus of the oculomotor nerve, supplying the constricting muscles of the iris. ... The human eye The pupil is the central transparent area (showing as black). ...


External links


The University of California, Davis, commonly known as UC Davis, is one of the ten University of California campuses. ...

Mesencephalon (midbrain)

cerebral peduncle: midbrain tegmentum (periaqueductal gray, ventral tegmentum, nucleus raphe dorsalis), 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. ... PeriAqueductal Gray (PAG) is the tegmental gray matter that is located around the cerebral aqueduct; it plays a role in the suppression of pain and in defensive behavior. ... Grays FIG. 712– Transverse section of mid-brain at level of superior colliculi. ... The nucleus raphe dorsalis consists of rostral and caudal subdivisions. ... 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 nucleus of the trochlear nerve is located in the midbrain, at the level of the inferior colliculus. ... The Edinger-Westphal nucleus is the accessory parasympathetic nucleus of the oculomotor nerve, supplying the constricting muscles of the iris. ...


  Results from FactBites:
 
lab6 (1698 words)
Superior olivary nucleus (Lower Pons, Middle Pons) - this nucleus lies medial to the forming lateral lemniscus in the caudal pons dorsal to the basilar pontine nuclei and dorsolateral to the medial lemniscus (Atlas pp.
Note that the central tegmental tract is medial and somewhat dorsal and the chief sensory nucleus of the trigeminal nerve is dorsolateral.
This nucleus lies dorsomedial to the rostral pole of the motor nucleus of the oculomotor nerve (Atlas p.
Yale- Cranial Nerve 3, pg. 5 (134 words)
The somatic motor component of CN III originates from the oculomotor nucleus located in the rostral midbrain at the level of the superior colliculus.
In a coronal cross-section of the brainstem the oculomotor nucleus is "V-shaped" and is bordered medially by the Edinger-Westphal nucleus and laterally and inferiorly by the medial longitudinal fasciculus which allows communication between various brainstem nuclei.
Fibers leaving the occulomotor nucleus travel ventrally in the tegmentum of the midbrain passing through the red nucleus and medial portion of the cerebral peduncle to emerge in the interpeduncular fossa at the junction of the midbrain and pons.
  More results at FactBites »

 
 

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