Rocket has a “cybernetic skeletal structure, enhanced phalange and metacarpal bones, and a genetically augmented cerebral cortex.”
metacarpal met·a·car·pal (mět'ə-kär'pəl)
Of or relating to the metacarpus. n.
Any of the five long bones that form the metacarpus and articulate with the bones of the distal row of the carpus and with the five proximal phalanges.