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Encyclopedia > Posterior commissure
Brain: Posterior commissure
Mesal aspect of a brain sectioned in the median sagittal plane. (Posterior commissure labeled at upper right.)
Median sagittal section of brain. The relations of the pia mater are indicated by the red color. (Label for posterior commissure is at center top.)
Latin c. posterior
Gray's subject #189 812
Part of
NeuroNames hier-475
MeSH [1]
Dorlands/Elsevier c_49/12251723

The posterior commissure is a rounded band of white fibers crossing the middle line on the dorsal aspect of the upper end of the cerebral aqueduct. Image File history File links Gray715. ... The pia mater (Latin: tender mother, itself a translation from Arabic) is the delicate innermost layer of the meninges - the membranes surrounding the brain and spinal cord. ... It has been suggested that History of the Latin language be merged into this article or section. ... 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 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. ...

Its fibers acquire their medullary sheaths early, but their connections have not been definitely determined. Most of them have their origin in a nucleus, the nucleus of the posterior commissure (nucleus of Darkschewitsch), which lies in the central gray substance of the upper end of the cerebral aqueduct, in front of the nucleus of the oculomotor nerve.

Some are probably derived from the posterior part of the thalamus and from the superior colliculus, while others are believed to be continued downward into the medial longitudinal fasciculus. Please wikify (format) this article as suggested in the Guide to layout and the Manual of Style. ... 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 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. ...

See also

  • anterior commissure

The Anterior Commissure (precommissure) is a bundle of white fibers, connecting the two cerebral hemispheres across the middle line, and placed in front of the columns of the fornix. ...

External links

  • Overview at www.mrc-cbu.cam.ac.uk

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...

  Results from FactBites:
IX. Neurology. 4c. The Fore-brain or Prosencephalon. Gray, Henry. 1918. Anatomy of the Human Body. (13322 words)
The ventral lamina is continuous with the posterior commissure; the dorsal lamina is continuous with the habenular commissure and divides into two strands the medullary striæ, which run forward, one on either side, along the junction of the medial and upper surfaces of the thalamus to blend in front with the columns of the fornix.
The anterior area, formed by the orbital surface of the frontal lobe, is concave, and rests on the roof of the orbit and nose; the middle area is convex, and consists of the under surface of the temporal lobe: it is adapted to the corresponding half of the middle cranial fossa.
On the medial surface, it is separated from the cingulate gyrus by the cingulate sulcus; and on the inferior surface, it is bounded behind by the stem of the lateral fissure.
Dorlands Medical Dictionary (5555 words)
gri´sea ante´rior/poste´rior medul´lae spina´lis anterior/posterior gray commissure of spinal cord: the transverse band of gray substance surrounding the central canal of the spinal cord external to the central gelatinous substance; it connects the intermediate, anterior, and posterior columns.
of spinal cord, posterior commissura alba posterior medullae spinalis.
(kom”ĭ-shər-ot´ə-me) [commissure + -tomy] surgical incision or digital disruption of the component parts of a commissure to increase the size of the orifice; this was formerly commonly done to separate the adherent, thickened leaflets of a stenotic mitral valve.
  More results at FactBites »



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