Animal model: Distribute the 78 SD rat randomly to 1、2、4、8、16、32d time point after the nerves were transected, each point is 13 ,there are group as dorsal nerve of penis、cavernous nerve and dorsal nerve and cavernous transection in per time point, each group is 3,and have3 for sham operation and 1 for normal control respectively.

Objective To investigate the therapy for small and short penis in simple obesity children.

Objective: At present, the time of treatment of micropenis and drug selection are still controversial, and poor efficacy.