Internal occipital vein
The descriptions of the internal occipital vein included smaller non-occipital vessels that confused the identification of the vessel. The internal occipital vein is analyzed to be the vein draining the primary visual cortex, which drains into the vein of Galen (VG) 1).
1)
Krogager ME, Jespersen B, Mathiesen TI, Benndorf G. Three underdogs among galenic veins: anatomical analysis and literature review of surgical relevant veins in the quadrigeminal cistern. Neurosurg Rev. 2022 Aug 10. doi: 10.1007/s10143-022-01842-z. Epub ahead of print. PMID: 35947231.