[allmendream]

Well yes, but in the path of the lumen there are three....(four if you count the ileocecal valve).

I mean there are precapillary sphincters too small for the eye to see. And the pupillary sphincter that allows us to see the way we do. And the urinary sphincter that keeps us from pissing our pants.

But for the purposes of making a joke......

It was a good one too, the laughter roared out! And I even managed to say it with a straight face. ;)

[Windflier]

May I say that it's just possible that you know entirely too much about sphincters?