Fourth ventricle
One cavity in a system of four communicating cavities within the brain that are continuous with the central canal of the spinal cord. The four ventricles consist of two lateral ventricles, the third ventricle and the fourth ventricle: Lateral ventricles: The lateral ventricles are in the cerebral hemispheres, one in each hemisphere. Each lateral ventricle consists of a triangular central body and four horns. The lateral ventricles communicate with the third ventricle through what is called the interventricular foramen (opening). The third ventricle is a median (midline) cavity in the brain that is bounded by the thalamus and hypothalamus on either side. Anteriorly (in front) the third ventricle communicates with the lateral ventricles and posteriorly (in back) the third ventricle communicates with what is called the aqueduct of the midbrain (or the aqueduct of Sylvius). The fourth ventricle is the most inferior (lowest) of the four ventricles of the brain. It extends from the aqueduct of the midbrain to the central canal of the upper end of the spinal cord with which it communicates by the two foramina (openings) of Luschka and the foramen (opening) of Magendie. The ventricles are filled with cerebrospinal fluid, which is formed by structures called choroid plexuses located in the walls and roofs of the ventricles.

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fourth ventricle n a somewhat rhomboidal ventricle of the posterior part of the brain that connects at the front with the third ventricle through the aqueduct of Sylvius and at the back with the central canal of the spinal cord

Medical dictionary. 2011.

Look at other dictionaries:

  • Fourth ventricle — Infobox Brain Name = PAGENAME Latin = ventriculus quartus GraySubject = 187 GrayPage = 797 Caption = Scheme showing relations of the ventricles to the surface of the brain. (Fourth ventricle labeled at bottom center.) Caption2 = Drawing of a cast …   Wikipedia

  • fourth ventricle — noun an irregular ventricle between the third ventricle and the central canal of the spinal cord • Hypernyms: ↑ventricle * * * noun : a somewhat rhomboidal ventricle of the posterior part of the brain that connects at the front with the third… …   Useful english dictionary

  • fourth ventricle of brain — fourth cerebral ventricle ventriculus quartus cerebri …   Medical dictionary

  • Taenia of fourth ventricle — Infobox Brain Name = PAGENAME Latin = taenia ventriculi quarti GraySubject = 187 GrayPage = 797 Caption = Rhomboid fossa. (Taenia of fourth ventricle labeled at bottom left.) Caption2 = The formatio reticularis of the medulla oblongata, shown by… …   Wikipedia

  • Medial eminence of floor of fourth ventricle — Not to be confused with Median eminence. Brain: Medial eminence of floor of fourth ventricle Rhomboid fossa. (Medial eminence visible but not labeled.) …   Wikipedia

  • Medullary striae of fourth ventricle — Brain: Medullary striae of fourth ventricle Rhomboid fossa (striae medullares labeled at center left) Latin striae medullares ventriculi quarti Gray s …   Wikipedia

  • Tela chorioidea of the fourth ventricle — Infobox Brain Name = PAGENAME Latin = tela choroidea ventriculi quarti GraySubject = 187 GrayPage = 798 Caption = Caption2 = IsPartOf = Components = Artery = Vein = Acronym = BrainInfoType = hier BrainInfoNumber = 636 MeshName = MeshNumber =… …   Wikipedia

  • lateral aperture of fourth ventricle — apertura lateralis ventriculi quarti …   Medical dictionary

  • median aperture of fourth ventricle — apertura mediana ventriculi quarti …   Medical dictionary

  • floor of fourth ventricle — fossa rhomboidea …   Medical dictionary

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