The anterior tibial artery supplies which angiosome and becomes which artery?

• A. Anterior ankle; Dorsalis Pedis
• B. Medial Calcaneal Branch; Posterior Tibial
• C. Anterior Deep Plantar; Plantar Arch
• D. Lateral Ankle; Fibular Artery

Answer: (A)

The key idea is how arteries map to vascular territories, or angiosomes, in the limb. The anterior tibial artery runs in the front of the leg, supplying the muscles and skin of the anterior compartment and the anterior ankle region. When it crosses the ankle, it continues onto the dorsum of the foot as the dorsalis pedis artery, which then supplies the dorsal aspect of the foot. So, the anterior tibial artery feeds the anterior ankle angiosome, and its continuation is the dorsalis pedis artery.

The other options describe branches or territories not carried by the anterior tibial artery's main course: the medial calcaneal branch comes from the posterior tibial artery and serves the heel; the plantar arch and deep plantar branches involve the plantar surface of the foot; the fibular (peroneal) artery supplies the lateral leg and does not become the dorsalis pedis.