Figure 4. Normal anatomy of the lower tarsal tunnel. Axial spin-echo T1-weighted MR image (500/12) shows the posterior tibial artery and veins (thin white arrow), flexor digitorum longus tendon (thick white arrow), flexor hallucis longus tendon (black arrowhead), medial plantar nerve (black arrow), lateral plantar nerve (circled), and flexor retinaculum (white arrowheads).