Ib txhais tes yog ib tug prehensile, ntau-ntiv tes appendage nyob rau hauv qhov kawg ntawm lub forearm los yog forelimb ntawm primates xws li tib neeg, chimpanzees, liab, thiab lemurs. Nws yog qhov kawg ntawm lub vertebrate forelimb thaum hloov tes, tuav lub cev nyob rau hauv qhov kawg ntawm lub forelimb ntawm tej yam vertebrates uas qhia tau zoo heev txav thiab yooj nyob rau hauv tus lej thiab nyob rau hauv tag nrho lub cev. Nws yog tsim los ntawm lub dab teg sib koom tes, cov pob txha carpal, cov pob txha metacarpal, thiab cov phalanges.
