Aqueduct of the midbrain
A canal that communicates between the third and fourth ventricles 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 the two lateral ventricles, the third ventricle and the fourth ventricle: {{}}Lateral ventricles: The lateral ventricles are in the cerebral hemispheres. 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 the aqueduct of the midbrain (also called 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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  • Aqueduct of Sylvius — A canal that communicates between the third and fourth ventricles 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 the two lateral ventricles …   Medical dictionary

  • aqueduct of sylvius — ˈsilvēəs Usage: usually capitalized S Etymology: translation of New Latin aquaeductus Sylvii, after Sylvius (Jacques Dubois) died 1555 French anatomist : a channel connecting the third and fourth ventricles of the brain * * * /sil vee euhs/, Anat …   Useful english dictionary

  • aqueduct of Sylvius — /sil vee euhs/, Anat. a canal in the midbrain, connecting the third and fourth ventricles of the brain. [named after Sylvius, Latinized name of Jacques Dubois (d. 1555), French anatomist] * * * …   Universalium

  • Sylvius, aqueduct of — A canal that communicates between the third and fourth ventricles 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 the two lateral ventricles …   Medical dictionary

  • Midbrain aqueduct — A canal that communicates between the third and fourth ventricles 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 the two lateral ventricles …   Medical dictionary

  • aqueduct — A conduit or canal. SYN: aqueductus. [L. aquaeductus] cerebral a. an ependyma lined canal in the mesencephalon about 20 mm long, connecting the third to the fourth ventricle. SYN: aqueductus mesencephali [TA], aqueductus cerebri, a. of cerebrum,… …   Medical dictionary

  • aqueduct — n. (in anatomy) a canal containing fluid. For example, the aqueduct of the midbrain (cerebral aqueduct, aqueduct of Sylvius) connects the third and fourth ventricles …   The new mediacal dictionary

  • Midbrain — Brain: Mesencephalon Inferior view mesencephalon (2), above (3) …   Wikipedia

  • Midbrain tegmentum — Brain: Midbrain tegmentum Transverse section of mid brain at level of superior colliculi. ( Tegmentum visible center right.) …   Wikipedia

  • Midbrain tectum — Brain: Midbrain tectum Deep dissection of brain stem. Lateral view. Latin t. mesencephali Part of Midbrain NeuroNames …   Wikipedia

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