As I know, this information is not available yet. If indeed it is not available, this question may wait for future answers. I have known out that some parts of human connectome are already mapped, so it might be already available. I have looked some sites, and seems it is not easy to find it for me. So, by answers to this question, I will see, and other readers may see, how much this knowledge is available.
I think, this question may also get answers about whether borders of internal urethral sphincter are strictly defined, and about how to navigate to or access the connectome data.