由于家兔耳缘静脉的血液先经耳尖部再流至耳根部,如果在耳缘静脉的耳尖部先经穿刺或割破而取血效果不理想时,就很难再于耳根部穿刺取血。因此我们认为,在耳缘静脉多次取血时,应从耳根部开始,逐渐移向耳尖部为宜。如以注射针头穿刺取血时,应从耳根部向耳尖方向插入耳静脉内。此外,为使血管扩张, As the rabbit ear vein blood flow through the ear tip and then flow to the root of the ear, if the first ear ear ear puncture or cut the blood taken is not satisfactory, it is difficult to puncture the ear . Therefore, we believe that many times in the ear vein blood, should start from the root of the ear, gradually moved to the ear tip is appropriate. Such as needle injection needle bleeding, should be from the ear to the direction of the ear into the ear vein. In addition, in order to make the blood vessels expand,