Superior medullary velum

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Brain: Superior medullary velum
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Coronal section of the pons, at its upper part. (Ant. med. velum labeled at center top.)
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Under surface of the cerebellum. (Ant. medullary velum labeled at center top.)
Latin velum medullare superius
Gray's subject #187 793
NeuroNames hier-588
Dorlands/Elsevier v_05/12849304

The superior medullary velum (anterior medullary velum, valve of Vieussens) is a thin, transparent lamina of white substance, which stretches between the superior peduncle; on the dorsal surface of its lower half the folia and lingula are prolonged.

It forms, together with the superior 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.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.


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