periaqueductal gray substance

periaqueductal gray substance
periventricular gray substance substantia grisea centralis.

Medical dictionary. 2011.

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  • Periaqueductal gray — Infobox Brain Name = PAGENAME Latin = s. grisea centralis GraySubject = 188 GrayPage = 806 Caption = Section through superior colliculus showing path of oculomotor nerve. Periaqueductal gray is the gray area just peripheral to the cerebral… …   Wikipedia

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  • substance — Stuff; material. SYN: substantia [TA], matter. [L. substantia, essence, material, fr. sub sto, to stand under, be present] alpha s. SYN: reticular s. (1). anterior perforated s. [TA] a region at the base …   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

  • tract — An elongated area, e.g., path, track, way. SEE ALSO: fascicle. SYN: tractus. [L. tractus, a drawing out] alimentary t. SYN: digestive t.. anterior corticospinal t. uncrossed fibers forming a small bundle in the anterior funiculus of the …   Medical dictionary

  • substantia grisea centralis — [TA] periaqueductal gray substance: diffuse collections of small cells immediately surrounding the ependymal lining of the third ventricle of the brain, around the cerebral aqueduct, and in the floor of the fourth ventricle. Called also central… …   Medical dictionary

  • fibrae spinoperiaqueductales — [TA] spinoperiaqueductal fibers: the subgroup of spinomesencephalic fibers of the anterolateral system that originate in the spinal cord and project to the periaqueductal gray substance …   Medical dictionary

  • locus caeruleus — [TA] locus ceruleus, locus coeruleus a pigmented area in the rostrolateral region of the pontine part of the fourth ventricle floor and extending into the mesencephalon in the lateral portion of the periaqueductal gray substance; cells of this… …   Medical dictionary

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