part of part of cerebellum superior medullary velum http://upload.wikimedia.org/wikipedia/commons/9/9b/Gray701.png BAMS:smv velum medullare rostralis rostral medullary velum BAMS:RMVE The superior medullary velum (anterior medullary velum, valve of Vieussens) is a thin, transparent of white substance, which stretches between the superior cerebellar peduncles; on the dorsal surface of its lower half the folia and lingula are prolonged. It forms, together with the superior cerebellar peduncle, the roof of the upper part of the fourth ventricle; it is narrow above, where it passes beneath the inferior colliculi, and broader below, where it is continuous with the white substance of the superior vermis. A slightly elevated ridge, the fraenulum veli, descends upon its upper part from between the inferior colliculi, and on either side of this the trochlear nerve emerges. Blood is supplied by branches from the superior cerebellar artery. [WP,unvetted]. Wikipedia:Superior_medullary_velum velum medullare craniale FMA:74508 BAMS:SMV BIRNLEX:1300 anterior medullary velum SCTID:369269006 UBERON:0002659 velum medullare anterius neuronames:593 velum medullare superior UMLS:C0152284 velum medullare superius white matter of metencephalon