The long small end bearing has a notch in the end of it that collects the overflow from that side of the top pressurized bearing, it faces the blind side on the entire opposite end of the head from the large rubber plug side and it has a hole that goes into the cam shaft.  Some oil is forced into the hollow cam shaft.

Overflow from that one half of that one pressurized bearing does make its way into the cam shaft, which does have 2 exit holes and an organized out flow path for that very minimal amount of oil flow.  

What doesn't go out the holes to lube the tappets goes all the way through the hollow cam shaft to lube the half bearing on the far side of the cam from where it started out.

Funny, that half bearing winds up being important as it carries load all the time yet I have never seen one galled or torn up.  Worn yes, but apparently they always get tossed up oil off the cam chain and this little dribble flow and are always well lubricated and cool.