Cerebral aqueduct (of Sylvius)
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The cerebral aqueduct is located within the midbrain, connecting the third and fourth ventricles and surrounded by periaqueductal grey matter (PAG), with the tectum of the midbrain located posteriorly and the tegmentum anteriorly. It is roughly 1-2 mm in diameter, with common descriptions separating it into pars anterior, an antrum and pars posterior.
History and etymology
Franciscus Sylvius (1614-1672) was a Dutch physician and anatomist, after which the duct of Sylvius and the Sylvian fissure are eponymously named.