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Definition of Ventricle, third

Ventricle, third: One cavity in a system of four communicating cavities within the brain that are continuous with the central canal that contains the spinal cord. The third ventricle is a median (midline) cavity in the brain and is bounded by the thalamus and hypothalamus on either side. It communicates anteriorly (in front) with the lateral ventricles, and posteriorly (in back) with the aqueduct of the midbrain, also known as the aqueduct of Sylvius. All the ventricles are filled with cerebrospinal fluid, which is formed by choroid plexuses, structures that are located in the walls and roofs of the ventricles.

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Reviewed on 12/27/2018
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