Just like a vasectomy. Its very simple. The vas deferens are a single thin tube detached and movable in the scrotum. It is not bundled in with any other cords, tubes, or organs as it runs through the mid to upper scrotum where its easiest to locate, isolate, cut and block off. The main spermatic cords are complex bundles of many veins, arteries, muscles, lymph nodes, and other organs all wrapped in a muscular tube. Cutting the vas deferens will cause very littlle bleeding and leak out clear sperm filled fluids. Cutting the main spermatic cord would cause intense gushing bleeding and require cutting thru many different layers and organs to completely sever that main bundle. Anyone would quickly realize if they cut the wrong one and started immense bleeding immediately from the cut. Just painlessly feeling your own vas cords verses your main spermatic cords is very easy to do
e two cords right away thru your scrotum skin. A trained person would not make a mistake and cut the wrong one by accident unless they cut close to the testicles or the inguinal canals where these cords are close together and harder to tell apart. Feel those same cords right as they attach to your balls and they crowd together in confused tubes. Feel them a few inches above your testicles in the open part of your scrotum and they are clearly different. Feel them where they enter your groin at the top of your scrotum and they are crowded together again and confusing. Drs cut the vas in the open portion of the scrotum above the testicles. That s why low hanging balls make vasectomies and castrations so much easier to do on a man than if he has high and tight hanging balls with shorter cords and tubes to work with. That extra long scrotum and cord hang space is where his cords separate and are easy to tell apart and access to cut and work on with lots of open space inside his scrotum.
A trained person could hand off doing a vasectomy on a man with short nut cords and high hanging tight balls to more experienced and trained staff member who d open up that tight scrotum to locate his harder to find short vas cords. Opening the scrotum up first to see all his shorter cords more carefully by sight and direct examination. This is an extra wide scrotum opening and extra care that is not needed to find the same vas cords in a man s scrotum with long cords and low hanging balls. Problem solved.
The men with long scrotums with longer cords and low hanging balls should pay less for vasectomies and castrations than men with shorter cords and tight, high hanging balls that are tougher to do surgery on.