What is the initial pathway of cerebrospinal fluid (CSF) flow in the brain?

The initial pathway of cerebrospinal fluid (CSF) flow begins with the formation of CSF in the lateral ventricles, which are situated within each hemisphere of the brain. Once CSF is produced in the lateral ventricles, it flows through the interventricular foramen (also known as Foramen of Monro) into the third ventricle. This transition marks the first step in the sequential movement of CSF through the ventricular system of the brain.

From the third ventricle, CSF then moves into the cerebral aqueduct, leading to the fourth ventricle, and subsequently into the subarachnoid space, where it circulates around the brain and spinal cord. Understanding this initial flow is crucial as it sets the stage for the later distribution and regulation of CSF, which plays a vital role in protecting the central nervous system and maintaining homeostasis.