develops from develops from composed primarily of proximally connected to Homo sapiens femur http://upload.wikimedia.org/wikipedia/commons/7/73/Gray252.png Endochondral longbone connecting the pelvic girdle with posterior zeugopodium skeleton.[VSAO, modified]. femoral XAO:0003214 SCTID:182046008 NCIT:C12717 BTO:0001284 Endochondral longbone connecting the pelvic girdle with posterior zeugopodium.[VSAO] galen:Femur MESH:D005269 proximal metapterygial mesomere of pelvic appendage CALOHA:TS-0322 AAO:0000887 EMAPA:19143 UBERON:0000981 AAO:0000889 MA:0001359 Most anatomists now agree that the three proximal bones of the tetrapod limbs are homologous to the two or three proximal elements of the paired fin skeleton of other sarcopterygians, that is the humerus-femur, radius-tibia, and ulna-fibula.[well established][VHOG] femoral bone os longissimum Wikipedia:Femur GAID:199 thigh bone os femorale VSAO:0000186 mesomere 1 of pevlic appendage Paired, elongate, cylindrical bones of endochondral origin that form the thighs, extending from the pelvic girdles to the knees.[AAO] UMLS:C0015811 os femoris VHOG:0001159 proximal metapterygial mesomere of pelvic fin FMA:9611 EFO:0001396 bone tissue hindlimb long bone upper leg bone pelvic girdle skeleton bone of hip region femur cartilage element femur endochondral element