Ventricle, fourth
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.

Medical dictionary. 2011.

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  • Ventricle — A ventricle is a chamber of an organ. For example, the four connected cavities (hollow spaces) in the central portion of the brain and the lower two chambers of the heart are called ventricles. * * * A normal cavity, as of the brain or heart. SYN …   Medical dictionary

  • Ventricle — Ven tri*cle, n. [L. ventriculus the stomach, a ventricle, dim. of venter the belly: cf. F. ventricule. See {Ventral}.] 1. (Anat.) A cavity, or one of the cavities, of an organ, as of the larynx or the brain; specifically, the posterior chamber,… …   The Collaborative International Dictionary of English

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

  • 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 — 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… …   Medical dictionary

  • Ventricle, brain — One of 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 the two lateral ventricles, the third ventricle and the fourth ventricle: Lateral… …   Medical dictionary

  • Ventricle, cerebral — One of 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 the two lateral ventricles, the third ventricle and the fourth ventricle: {{}}Lateral… …   Medical dictionary

  • Ventricle, lateral — 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… …   Medical dictionary

  • Ventricle, third — 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… …   Medical dictionary

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