Radius Upper end head of radius桡骨头, neck of radius桡骨颈 Lower end styloid process茎突 lateral ly, ulnar notch尺切迹 medially, and carpal articular sur face腕关 节面 infer lyRadius ◼ Upper end: head of radius桡骨头, neck of radius桡骨颈 ◼ Lower end: styloid process 茎突laterally, ulnar notch尺切迹 medially, and carpal articular surface腕关 节面 inferiorly