A leg is a weight-bearing and locomotive anatomical structure, essential for movement in animals and humans, distinguished by its columnar form and jointed flexibility. From an anatomical standpoint, it includes bones, muscles, and connective tissues, with differences among species—bipedal humans, quadrupedal mammals, or arthropods—each modifying its structure to suit particular functions.
Authors such as John Lord Peck emphasized its anatomical similarities to the arm, while Silas Weir Mitchell investigated phantom limb sensations, and John Harvey Kellogg described its skeletal makeup. The study of the leg extends across medicine, engineering, and taxonomy, underscoring its widespread role in mobility and structural design.