The extremities are the appendages of the body: arms, forearms, thighs, legs, fingers, and toes.
There are compartments in both the upper and lower extremities.
Extremity. An "extremity" refers to your limbs (arms and legs). Lower extremities are your legs; upper extremities are your arms.
A limb.
Upper Extremities is the studio album by Bill Bruford & Tony Levin