第だい三さん脳のう室しつだいさんのうしつMeanings1nounthird ventricleanatomyAnatomical term for the third ventricle of the brain.第だい三さん脳のう室しつは間かん脳のうの正せい中ちゅう線せん上じょうに位い置ちする。The third ventricle is located on the midline of the diencephalon.MRI