I have no idea where valves are in veins. I understand they are there to prevent backflow.
I also have never heard of anyone checking for or worrying about valves before.
However, what would happen if someone injected into a valve ? It sounds scary.
As an analogy, just imagine a flapper valve in a hose, and a steel shaft is forced right into the
valve mechanism - it would probably destroy the valve and clog the hose.
So is there a way to figure out where the valves are ?
Also - are they all over the place and in every vein ? In other words, lets say for example, a 4-inch vein
along the back of the Hand. Would it likely have a valve every half-inch . . . every inch . . just one
valve for the entire 4-inch segment . . or perhaps no valve ?
My guess is that only the large veins have valves and not the small, thin veins. But that's just a guess.
Thanks
I also have never heard of anyone checking for or worrying about valves before.

However, what would happen if someone injected into a valve ? It sounds scary.
As an analogy, just imagine a flapper valve in a hose, and a steel shaft is forced right into the
valve mechanism - it would probably destroy the valve and clog the hose.
So is there a way to figure out where the valves are ?
Also - are they all over the place and in every vein ? In other words, lets say for example, a 4-inch vein
along the back of the Hand. Would it likely have a valve every half-inch . . . every inch . . just one
valve for the entire 4-inch segment . . or perhaps no valve ?
My guess is that only the large veins have valves and not the small, thin veins. But that's just a guess.
Thanks