The |tibialis anterior| is a thick and fleshy muscle that, as the name implies, sits on the front of the |tibia|, the main lower leg bone. It originates from the upper half of the |tibia|, just below the knee and tapers into a long, prominent ~tendon~ about two-thirds of the way down the leg. The long ~tendon~ goes through the ankle to insert in the bottom of the inside arch of the foot (in the |tarsal bones|). This muscle controls the descent of the foot during walking after the heel strikes the ground.