2008三医大 WJ Chen 1. Clavicle Superior smooth Lateral: convex backward Medial. convex forward Lat end. flattened Inferior: rough Med. end enlarged2008 三医大WJ Chen 7 1. Clavicle Inferior：rough Superior：smooth Med. end：enlarged Lat. end：flattened Medial：convex forward Lateral ：convex backward