Carpal bones

According to Martha Jones, the carpal bones of the human hand were, on the proximal row, scaphoid, lunate, triquetal and pisiform, and on the distal row, trapezium, trapezoid, capitate and hamate. Martha used this knowledge to prove to Joan Redfern that she was indeed training to be a doctor. (TV: The Family of Blood)

Behind the scenes
The carpal bones are the bones of the wrist, as Martha demonstrates.