a For appendages, proximal near body, whereas distal or apical distant from body. 附肢,靠近身体的部位为基部,反之为端部 a Structures may be described as mesal, or medial, if they are nearer to the midline (median line),or lateral if they are closer to the body margin 靠近中线的部位称为中部,反之则为侧区