I restrict my google use to stuff Ater would know, and it's typically the really simple stuff that I've memorized anyways at this point.
As for where to draw the line, I draw it at any permanent physical change to a character. Amputation, crippling, etc, I'll typically push realism aside so folks can keep their characters. After all, a crippled character isn't everyone's cup of tea. Trust me, though, I never just slap a bandaid on it, nor do I think any of the doctor characters do.
That being said, if at any point you're doing medical rp with me (and I typically ask if the wound is that bad), you're welcome to tell me OOCly to bump up the realism. I'm always willing to hack off a limb or two.