Velum interpositum

A.Prof Frank Gaillard et al.

The velum interpositum is a small membrane containing a potential space just above and anterior to the pineal gland which can become enlarged to form a cavum velum interpositum

Gross anatomy

The velum interpositum is formed by an invagination of pia mater forming a triangular membrane the apex of which points anteriorly.

Boundaries

It varies in shape from persion to person, sometimes interposed between the internal cerebral veins and splenium, and depending on whether or not there is a cavum vergae (in which case the columns of the fornices are displaced inferiorly, narrowing the velum interpositum). 

When somewhat distended by fluid it forms a small triangular (in axial section) space and is referred to as a cavum velum interpositum. If larger and exterting mass effect it is known as a cavum velum interpositum cyst

The space between the two leaves of pia contains the posterior medial choroidal arteries 2

Neuroanatomy
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Article information

rID: 21621
Section: Anatomy
Tag: refs
Synonyms or Alternate Spellings:

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Cases and figures

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    Fig 1: Normal vel...
    Case 1: cavum velum interpositum cyst
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