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The lateral ventricle are one of a system of four communicating cavities within the brain that are continuous with the central canal of the spinal cord.
Four ventricles consist of the two lateral ventricles, the third ventricle and the fourth ventricle.

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 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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