The ventricle located directly under the corpus callosum is the body of the lateral ventricle (part of the paired lateral ventricles).

Key anatomy

  • The lateral ventricles are paired cavities within each cerebral hemisphere.
  • Their body (central part) runs posteriorly beneath the corpus callosum between the frontal horn and the atrium.
  • Superiorly, this body is bordered by the body of the corpus callosum , meaning it lies directly under it.

Why this is the correct option

  • Descriptions of the ventricular system state that “the body of the lateral ventricle passes posteriorly under the corpus callosum” , confirming the relationship.
  • The third ventricle lies lower, between the thalami, and the so‑called “fifth ventricle” (cavum septi pellucidi) is not a true ventricle.

Extra exam tip

  • If you see a question asking “which ventricle lies beneath the corpus callosum,” choose lateral ventricle (body) , not third or fourth ventricle.

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