One SD rat at embryonic 14 days underwent caesarean operation,and fetal rat and fetal membrane were taken out together and used for preparing new embryonic spinal cord.

• 取孕14d的SD大鼠1只,施行剖腹手术将胎鼠连同胎膜一同取出,用于新鲜胚胎脊髓的制备。