What is the name of the fluid-filled space in the midline of the brain that lies between the lateral ventricles?

Prepare for the Neurosonology Exam with our comprehensive quiz. Engage with interactive flashcards, multiple-choice questions, and detailed explanations. Enhance your readiness and confidence for the test!

The Cavum septum pellucidum is the fluid-filled space in the midline that lies between the two lateral ventricles. It sits between the leaves of the septum pellucidum, just above the roof of the ventricles and anterior to the third ventricle. This space is a developmental feature that can persist as CSF-filled gaps on imaging in some individuals. The other structures are not spaces between the lateral ventricles: the interventricular foramen is a channel connecting the lateral ventricles to the third ventricle, the third ventricle is a midline ventricle, and the cerebral aqueduct connects the third and fourth ventricles. Hence, the Cavum septum pellucidum best matches the description.