Figure 3b. Normal anatomy of the upper tarsal tunnel. (a) Axial spin-echo T1-weighted MR image (repetition time msec/echo time msec = 500/12) shows the lateral plantar nerve (black arrowhead), medial plantar nerve (black arrow), posterior tibial artery and veins (white arrow), flexor hallucis longus tendon and muscle (FHL), deep aponeurosis (white arrowheads), and tibia (T). (b) Corresponding transverse 13.5-MHz US scan shows the PTN branches (circled), posterior tibial artery and veins (thick white arrow), flexor digitorum longus tendon (black arrow), and posterior tibial tendon (thin white arrow).