In anatomy, a foramen (pl. foramina)'s any opening. Examples Skull See Foramina of skull Other the apical foramen's the hole at the tip of the root of a tooth. the foramen ovale (heart)'s a hole between the venous and arterial sides of the fetal heart. the foramen transversarium's one of a pair of openings in each cervical vertebra, in which the vertebral artery travels. vertebral foramen obturator foramen lesser sciatic foramen greater sciatic foramen An opening of the bone (Vertebral Co… (More on Foramen)