(3) ductuli epididymis with least and pilus on the epidermis and (4) circular ductus epididymidis with least cutaway.

③小：最小，上皮有纤毛；④：切面最少，腔圆。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微受精的方法，并探讨小精子在显微注射进入卵母细胞后的受精能力。