Fig. 12-26 Muscular and ligamentous attachments of the superior ends of the right tibia and fibula. In the lateral view, note that the interosseous border of the tibia separates the attachments of the tibialis anterior and the tibialis posterior. The origin of the fibularis longus and extensor digitorum longus from the tibia is not shown. (See fig. 12-23.) Lower right, Schematic representation of the relations of the tibial collateral ligament, which crosses the semimembranosus tendon but which is deep to the tendons of the gracilis, semitendinosus, and sartorius (the pes anserinus). Click for high resolution image.