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[[Image:Tst456yh.svg|right|thumb|Palm of left hand, showing position of skin creases and bones, and surface markings for the volar arches.]]

[[Image:Tst456yh.svg|right|thumb|Palm of left human hand, showing position of skin creases and bones, and surface markings for the volar arches.]]

The '''hand''' is an extremity possessed by most bipedal mammals. The hand typically contains extensions called fingers and a set of muscle groups that allow for more complicated and precise movements in comparison to the other extremities. The primary purpose of the hand is to allow an organism to physically manipulate objects in its environment. Humans and other primates use the hand as a means for building and controlling tools.  

The '''hand''' is an extremity possessed by most bipedal mammals. The hand typically contains extensions called fingers and a set of muscle groups that allow for more complicated and precise movements in comparison to the other extremities. The primary purpose of the hand is to allow an organism to physically manipulate objects in its environment. Humans and other primates use the hand as a means for building and controlling tools.