Anatomy question: where do the nerves end

[Jet]

I wonder where in the testicles the nerves end. Do they end in the protective encapsulation or do they run trough the sperm generating cells as well? So if you got hit in the balls, which nerves exactly tell you you got hit? What if you got a ruptured testicle, does that mean nerves in the encapsulation are continuously sending signals the encapsulation is ruptured?

btw: Another organ which does not have nerves running trough it is the brain.