- 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.
Look at other dictionaries:
aqueduct of mesencephalon — aqueduct of midbrain aqueductus mesencephali … Medical 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
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 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 … Medical dictionary
Midbrain tectum — Brain: Midbrain tectum Deep dissection of brain stem. Lateral view. Latin t. mesencephali Part of Midbrain NeuroNames … Wikipedia
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
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
midbrain — mesencephalon. * * * mid·brain mid .brān n the middle division of the three primary divisions of the developing vertebrate brain or the corresponding part of the adult brain that includes a ventral part containing the cerebral peduncles and a… … Medical dictionary