Humerus肱骨 Upper end: head of humerus肱骨头, anatomi ca neck解剖颈, greater and lesser tubercles大、小结节, surgica neck外科颈 Shaft: deltoid tuberosity三角肌粗隆on lateral surface, and a groove for rad a nerve 桡神经沟on poster ior sur faceHumerus 肱骨 ◼ Upper end: head of humerus肱骨头, anatomical neck解剖颈, greater and lesser tubercles大、小结节, surgical neck外科颈 ◼ Shaft: deltoid tuberosity三角肌粗隆on lateral surface, and a groove for radial nerve桡神经沟 on posterior surface