Uberon definition : A portion of the lateral venous sinus, bulging prominently into the mastoid cavity,
that serves as a principal conduit by which blood leaves the cranium[EPIC]. The sigmoid
is drained by the internal jugular vein;
A portion of the lateral venous sinus, bulging prominently into the mastoid cavity,
that serves as a principal conduit by which blood leaves the cranium[EPIC]. The sigmoid
is drained by the internal jugular vein