Third 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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third ventricle n the median unpaired ventricle of the brain bounded by parts of the telencephalon and diencephalon

Medical dictionary. 2011.

Look at other dictionaries:

  • third ventricle — n. one of the four cavities of the brain, lying on the midline between the cerebral hemispheres * * * …   Universalium

  • third ventricle — n. one of the four cavities of the brain, lying on the midline between the cerebral hemispheres …   English World dictionary

  • Third ventricle — Infobox Brain Name = PAGENAME Latin = ventriculus tertius cerebri GraySubject = GrayPage = Caption = Scheme showing relations of the ventricles to the surface of the brain. Caption2 = IsPartOf = Components = Artery = Vein = BrainInfoType = hier… …   Wikipedia

  • third ventricle — noun a narrow ventricle in the midplane below the corpus callosum; communicates with the fourth ventricle via the Sylvian aqueduct • Hypernyms: ↑ventricle …   Useful english dictionary

  • third ventricle — noun Date: 1615 the median unpaired ventricle of the brain bounded by parts of the telencephalon and diencephalon …   New Collegiate Dictionary

  • third ventricle of brain — third cerebral ventricle ventriculus tertius cerebri …   Medical dictionary

  • Tela chorioidea of the third ventricle — Infobox Brain Name = PAGENAME Latin = tela choroidea ventriculi tertii GraySubject = 189 GrayPage = 841 Caption = Coronal section of lateral and third ventricles. (Tela chorioidea labeled at left.) Caption2 = IsPartOf = Components = Artery = Vein …   Wikipedia

  • floor of third ventricle — the inferior interior surface of the third ventricle, formed by the optic chiasm, the tuber cinereum, the infundibulum, the mammillary bodies, and the posterior perforated substance …   Medical dictionary

  • roof of third ventricle — the tela choroidea ventriculi tertii and the ependyma, which form the superior covering structures of the third ventricle …   Medical dictionary

  • choroid plexus of third ventricle — p. choroideus ventriculi tertii …   Medical dictionary

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