THE LOWER EXTREMITY, ANTERIOR. 585 



wide that passes from the front of the tibia to the front of 

 the fibula just above the ankle joint. It contains one sy no- 

 vial sheath for the tendon of the tibialis anticus. The ten- 

 dons of the other muscles pass under it without any synovial 

 investment. 



(2) The lower portion. This band lies just below the 

 level of the joint, and is arranged like a " horizontal " -< . 

 The single limb being external and attached to the upper 

 anterior surface of the calcis. 



The single limb is split for the passage of the tendons of 

 the extensor longus digitorum and the peroneus tertius, 

 and is lined by synovial membrane common for these 

 tendons. 



The upper " leg " of the -< is attached to the internal 

 malleolus, passing over the tendon of the extensor proprius 

 hallucis and mostly under the tendon of the tibialis anticus, 

 a thin investment covering the tendon of the latter muscle. 



The tendon of the former muscle has a separate synovial 

 sheath under this portion of the ligament. The lower 

 " leg" of the -< passes over the tendons of the extensor 

 proprius hallucis and tibialis anticus to the inner side of the 

 foot where it blends with the plantar fascia. 



The synovial sheath of the tibialis anticus is prolonged 

 from the upper portion, down under this part of the annular 

 ligament. 



The External Annular Ligament. Fig. 123. 



This is that portion of the deep fascia of the leg and 

 foot, which extends from the external malleolus to the outer 

 posterior and lower borders of the os calcis. It retains 

 the tendons of the peroneus longus and brevis in place 

 behind the external malleolus. The tendons are surrounded 

 by a common synovial sheath. 



