Foramen, interventricular definition - medical term
An opening between the lateral and third ventricles
in a system of four communicating cavities within the brain that are continuous
with the central canal of the spinal cord.
T he four ventricles consist of the two lateral ventricles, the third ventricle
and the fourth ventricle:
Lateral ventricles: The lateral ventricles are in the cerebral hemispheres.
Each lateral ventricle consists of a triangular central body and four horns.
The lateral ventricles communicate with the third ventricle through the interventricular
foramen (opening).
The third ventricle is a median (midline) cavity in the brain that is bounded
by the thalamus and hypothalamus on either side. Anteriorly (in front) the third
ventricle communicates with the lateral ventricles and posteriorly (in back)
the third ventricle communicates with what is called the aqueduct of the midbrain
(or the aqueduct of Sylvius).
The fourth ventricle is the most inferior (lowest) of the four ventricles
of the brain. It extends from the aqueduct of the midbrain to the central canal
of the upper end of the spinal cord with which it communicates by the two foramina
(openings) of Luschka and the foramen (opening) of Magendie.
The ventricles are filled with cerebrospinal fluid, which is formed by structures
called choroid plexuses located in the walls and roofs of the ventricles.
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