POSTERIOR TIBIAL REGION. 



237 



plantaris. By its deep surface with the intermuscular fascia, which 

 separates it from the flexor longus digitorum, tibialis posticus, flexor 

 longus pollicis, from the posterior tibial vessels and nerve, and from 

 the peroneal vessels. 



Fig. 92 * 



Fig. 93.t 



Actions. The three muscles of the calf draw powerfully on the 

 os calcis, and lift the heel ; continuing their action, they raise the 

 entire body. This action is attained by means of a lever of the 

 second power, the fulcrum (the toes) being at one end, the weight 



* The muscles of the anterior tibial region. 1. The extensor muscles inserted into 

 .the patella. 2. The subcutaneous surface of the tibia. 3. The tibialis anticus. 4. 

 The extensor communis digitorum. 5. The extensor proprius pollicis. 6. The pero- 

 neus tertius. 7. The peroneus longus. 8. The peroneus brevis. 9, 9. The borders 

 of the soleus muscle. 10. A part of the inner belly of the gastrocncmius. 11. The 

 extensor brevis digitorum ; the tendon in front of this number is that of the peroneus 

 tertius ; and that behind it, the tendon of the peroneus brevis. 



t The superficial muscles of the posterior aspect of the leg. 1. The biceps muscle 

 forming the outer hamstring. 2. The tendons forming the inner hamstring. 3. The 

 popliteal space. 4. The gastrocnemius muscle. 5, 5. The soleus. 6. The tendo 

 Achillis. 7. The posterior tuberosity of the os calcis. 8. The tendons of the peroneus 

 longus and brevis muscles passing behind the outer ankle. 9. The tendons of the deep 

 layer passing into the foot behind the inner ankle. 



