Term Name:	fourth ventricle median aperture
Synonyms:	apertura mediana ventriculi quarti, arachnoid forament, fourth ventricle median aperture, median aperture
Definition:	The large midline opening of the posterior inferior part of the roof of the fourth ventricle that connects the fourth ventricle to the posterior cerebromedullary cistern and the spinal cord
Ontology:	Uberon Ontology [UBERON:0003991]