part of part of Homo sapiens rib 1 surface groove groove for subclavian vein of first rib 2026-03-19T00:00:00Z A surface groove on the superior surface of the first rib, situated anterior to the scalene tubercle, that accommodates the subclavian vein as it crosses the rib. This groove lies medial to the groove for the subclavian artery and is a unique feature of the first rib, reflecting its relationship with the major vessels of the upper limb. David Osumi-Sutherland