The posterior tibial artery is a major blood vessel in the lower leg. It branches off from the popliteal artery, which is located behind the knee. This artery supplies oxygenated blood to the muscles and tissues of the lower leg and foot, playing a crucial role in maintaining their health and function. As it travels down the leg, the posterior tibial artery divides into smaller branches, including the medial plantar artery and the lateral plantar artery. These branches further supply blood to the sole of the foot, ensuring that the area receives adequate circulation for movement and overall well-being.