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Peter P.; At UCL he had withered dehydrated human arm on the desk in front of the blackboard, the forefinger extended, looking like a large version those skin and bone things for dogs to chew on, and when he wanted to point to something he had drawn on the top board, which he had now slid up, he used it as a pointer, to the sound of screams from the ladies.
I think the surgeon, Sir Lancelot Spratt, played by James Robertson Justice in 'Doctor in the House' was based on him.