Groove for transverse sinus

A groove for transverse sinus is a wide sulcus that extends sideways from the internal occipital protuberance. It runs laterally on the inside of the squamous part of occipital bone, on both right and left sides of the internal occipital protuberance, and ends at the mastoid angle of the parietal bone. From there it continues down as the sigmoid sulcus. This transverse sulcus houses the transverse venous sinuses, which transform into the sigmoid sinus and then drain into the internal jugular vein. Generally, the right transverse sulcus is wider than the left one and connects medially with the superior sagittal sulcus.