Definitions for "Third ventricle"
The part of the brain ventricles that extends from the midbrain through the diencephalon.
a narrow ventricle in the midplane below the corpus callosum; communicates with the fourth ventricle via the Sylvian aqueduct
the thin chamber deep in the brain that contains CSF and connects the lateral ventricles to the cerebral aqueduct; CSF must flow through the third ventricle in order to exit the brain.