THE FOOT. 273 



peroneus longus and brevis, the former being the supe- 

 rior ; they are contained in a common sheath (at first), 

 and have a common synovial membrane. 



In the inner, the pulsations of the posterior tibial 

 artery are plainly seen or felt, and beneath the integu- 

 ment are the internal saphena vein and nerve, which lie 

 upon the internal annular ligament, which is attached 

 to the inner malleolus and inner surface of the os calcis, 

 and forms with the tibia, os calcis and astragalus a series 

 of separate canals, containing from before backwards 

 the tendons of the tibialis posticus; the flexor longus 

 digitorum ; the posterior tibial vessels and nerve, run- 

 ning in a sheath of their own derived from the contigu- 



FIG. 47. 



Relations of parts behind the inner malleolus. 1, 1. Tibialis posticus. 2. Tendo- 

 Achillis. 3. Tibialis anticus. 4, 4. Flexor longus digitorum. 6. Posterior tibial 

 artery. 8. Posterior tibial nerve. The tendon of the flexor longus pollicis is too 

 deeply placed to be shown in this view. (HEATH.) 



ous septa; the flexor longus pollicis, the canal of which 

 is formed partly by the astragalus. Each of these canals 

 has a separate synovial membrane. The tendo-Achillis 

 has a separate sheath derived from this aponeurosis. 

 The posterior tibial artery at the ankle-joint lies be- 



