If it can't accomplish the task, it cops the flak. But it's the brain area that's mostly at fault, not the poor old arm or leg.
*OK, I admit I didn't know that was the spelling of Vyvyan, I didn't know his surname was Basterd, nor that he was a medical student. I wonder if he's made it into the NHS as a doctor yet? (Frightening thought.) Wikipedia, you've done it again.