part of ends during starts during death radio-ulna humerus tibia-fibula femur organ part diaphysis eriksegerdell 2013-04-10T14:00:23Z Organ part consisting of the main section or midsection of a long bone, which in Xenopus are the tibia-fibula and femur of the hindlimb, and the radio-ulna and humerus of the forelimb. xenopus_anatomy XAO:0004488 NF stage 55