"median or lateral anterior pontomesencephalic vein(s)"
"median or lateral anterior medullary vein(s)"
"The veins of the brainstem drain the medulla, the pons and the mesencephalon, including the cerebral peduncles, tegmentum and quadrigeminal plate. They are characterised by several variations and feature multiple connections draining into the inferior, medial superior petrosal sinuses or form a transtentorial anastomosis via the basal vein of Rosenthal with the vein of Galen. Less frequently they connect via bridging veins to the cavernous, marginal and sigmoid sinuses or the jugular bulb 1."
"The veins of the brainstem drain the medulla, the pons and the mesencephalon, including the cerebral peduncles, tegmentum and quadrigeminal plate. They are characterised by several variations and feature multiple connections draining into the inferior, medial superior petrosal sinuses or form a transtentorial anastomosis via the basal vein of Rosenthal with the vein of Galen. Less frequently they connect via bridging veins to the cavernous, marginal and sigmoid sinuses or the jugular bulb 1."