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Fig. 3A —Inferior extensor retinaculum with tibialis anterior tendon and other extensor tendons in cadaveric foot. Oblique coronal T1-weighted MR image (TR/TE, 600/24) obtained at level of tarsal sinus (A) and corresponding anatomic section (B) show tibialis anterior tendon located within tunnel formed by oblique superomedial limb of inferior extensor retinaculum (straight arrows), visualized as low-signal-intensity band in A. This limb inserts at anterior crest of tibia (T) medially and continues to stem (curved arrow) laterally. From stem, intermediary (crossed arrow) and lateral (arrowheads) roots are seen, forming another tunnel for extensor tendon. A = tibialis anterior tendon, H = extensor hallucis longus tendon, D = extensor digitorum longus tendon.