Cavity of medulla oblongata is also known as Matacoel.
Explanation:
Third Ventricle of Brain is known as Diocoel, Fourth Ventricle is known as Metacoel. These are connected by a Sylvius Aqueduct, also know as iter. Metacoel continues into neurocoel which is the cavity of spinal cord. First and Second Ventricles are known as Lateral Ventricles and also Paracoel. Both the Paracoel combine with each other and open into diencephalon through Foramen of Munro.
Little extra: There are in total three aperture found on the surface of Metacoel On the dorsal surface, there is Foramen of Magendie, on Lateral surface there is Foramen of Luscha(×2). These allow CSF from Ventricles to open into subarachnoid space.
