develops from develops from composed primarily of metacarpal bone bone tissue metacarpal bone of digit 1 finger 1 metacarpus hand digit 1 metacarpal FMA:23899 metacarpal 1 NCIT:C52796 metacarpal of thumb thumb metacarpal manual digit 1 metacarpus A metacarpal bone that distally_connected_to a proximal phalanx of manual digit 1. metacarpal bone of first digit of hand first digit of hand metacarpal metacarpal bone of thumb hand digit 1 metacarpal bone UBERON:0003645 EMAPA:19112 metacarpal I forelimb digit 1 metacarpus metacarpal of hand digit 1 MA:0001364 first metacarpal bone thumb metacarpal bone metacarpal bone of hand digit 1 AAO:0010616 SCTID:181973009 first digit of hand metacarpal bone metacarpal of first digit of hand metacarpal bone digit 1 manual digit 1 metacarpus cartilage element metapodium bone 1 manual digit 1 metacarpus endochondral element