Legs are the paired lower limbs of the human body that extend from the hips down to the feet. Each leg is composed of several key sections: the thigh, knee, lower leg, ankle, and foot. The thigh contains the femur, which is the longest and strongest bone in the body and connects the hip to the knee. The knee is a hinge joint that connects the thigh to the lower leg, which contains the tibia and fibula bones. The ankle connects the lower leg to the foot, which is made up of numerous small bones, muscles, and tendons that support balance and movement.

Legs provide the essential function of supporting the body’s weight and enabling mobility. They allow humans to perform activities such as standing, walking, running, jumping, and climbing. The muscles in the legs—including the quadriceps, hamstrings, and calf muscles—work together to power these movements. Nerves and blood vessels supply the legs, coordinating muscle activity and providing sensation. Additionally, legs contribute to posture and balance and play a role in non-verbal communication through gestures and body stance.