Alien anatomy can be very confusing. To play this realistically, make sure the aliens in your game don't conform to the unrealistic almost human stereotype. Nothing makes an impromptu medical emergency more interesting than not even being sure where the victim's major life support and sensory organs are.
EW-3 Midwife Droid: Don't worry, I've downloaded a human anatomy chart. It's an older chart, but it checks out.
EW-3 Midwife Droid: Oh, my shaking hands... must... concentrate!
EW-3 Midwife Droid: Looks like I picked the wrong week to quit XL oil.
EW-3 Midwife Droid: So much blood... feeling faint...
EW-3 Midwife Droid: Excuse me ma'am, can you tell me where this partially detached organ goes?
Padmé: I think... it's a boy.
EW-3 Midwife Droid: So... behind your ancillary heart?
Obi-Wan: Are there any other doctors on this station?