The flexor hallicus longus (FHL) is the primary flexor muscle of the big toe. It originates at the back of the leg, transitions into a long tendon as it enters the foot and attaches on the bottom of the big toe.
The peroneus brevis (PB) muscle starts in the leg and continues along the outside of the ankle. It then takes a sharp turn and ends on the outside of the foot. The peroneus brevis works with the peroneus longus (PL) to turn the ankle and foot outward.