The lateral ventricles are two irregularly shaped cavities. They are located in each hemisphere of the cerebrum. They communicate with the third ventricle by way of the interventricular foramen. Through the third ventricle, they communicate with the fourth ventricle by the cerebral aqueduct. They are lined by the ependyma. The ependyma’s function is to secret part of the cerebrospinal fluid. Each of the ventricles consists of four parts: a central portion or body and three cornua or horns. The cornua are designated anterior, middle, and posterior. They extend into the frontal, temporosphenoid, and the occipital lobe of the cerebrum. Each of the ventricles is separated in front by a vertical partition called the septum lucidum. The body of the lateral ventricle is triangular in a coronal section. Its anteroposterior diameter is the longest and its vertical diameter is the shortest. It extends from the interventricular foramen to the splenium of the corpus callosum. It is bound above by the corpus callosum. It’s bound internally by the posterior narrow portion of the septum lucidum and by the attachment of the corpus callosum to the fornix. Externally, it is bound by the merging angle formed by the corpus callosum. The frontal horn extends into the frontal lobe. The occipital lobe extends into the occipital lobe. The temporal horn extends into the temporal lobe.

Ventricule latéral