Part of
the ventricular system of the brain. Is sandwiched between the
brainstem and
the cerebellum. 4.de ventricle has in its thin back wall two cerebrospinal fluid-producing
blood vessel/choroidal braids and the three openings, two to the side (right and left foramen
Lushka) and one posterior (
foramen Magendie), which allow
cerebrospinal fluid to flow out of the ventricular system to the
subarachnoid space from where it can pass into the bloodstream (channeled into the
upper mid-orbital blood channel using the so-called arachnoid midges to be finally carried away with the blood from the head).