part of part of Homo sapiens vertebral bone 1 surface groove groove for vertebral artery of first cervical vertebra 2026-03-19T00:00:00Z A surface groove curving along the superior surface of the posterior arch of the atlas (C1), transmitting the vertebral artery and the first cervical nerve as they pass from the transverse foramen toward the foramen magnum. David Osumi-Sutherland