You know what it looks like… but what is it called?
TAKE THE QUIZ“sylvius”
The following 2 entries include the term sylvius.
aqueduct of Sylvius
noun: a channel connecting the third and fourth ventricles of the brain
fissure of Sylvius
noun-
- Before we went to her house, Hannah told us her aunt was a flibbertigibbet.


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Merriam-Webster unabridged