PLATE XXXII. 



THE SECOND VIEW OF THE CALF, SOLEUS, PLANTARIS, 

 AND DEEP VIEW OF THE POPLITEAL SPACE. 



In this plate the gastrocnemius has been removed, having been cut through near 

 its origin and also near its junction with the soleus to form the tendo Achillis. The 

 aponeurosis of insertion of the sartorius has been turned forwards to show the way in 

 which the tendons of the gracilis and semitendinosus lie on its 

 deep aspect, being incorporated with it. The fibres of these ' 

 two last muscles can be traced separately into the bone 

 only by cutting them out of the sartorius aponeurosis, a 

 thin layer of which comes down on their deep aspect. The 

 lower portion of the aponeurosis is continued into the deep 

 fascia of the leg, the fibres being traceable nearly as far as the 

 ankle. The semitendinosus and gracilis also send slips to join 

 the fascia. 



The cutaneous nerve supply of the back of the leg is 

 shown in the annexed diagram : (a) Termination of small 

 sciatic ; (l>) lower branch of internal cutaneous ; (c) cutaneous 

 twigs from the long saphenous ; (d) cutaneous branches from 

 external popliteal ; (e) communicans peronei ; (/) communi- 

 cans tibialis (under fascia), the junction of these two (e and/) 

 forming the short or external saphenous. 



The plan tar is muscle bears the same relation to the plantar 

 fascia that the palmaris longus does to the palmar fascia, but 

 it has been cut off entirely from the remainder of its tendon by 

 the outgrowth of the heel. In most mammals this muscle 

 supplies the perforated flexor tendons to the toes, and is far 

 better developed than in man, where it is functionless save that it may feebly assist 

 the action of the tendo Achillis. 



The tibial origin of the soleus is secondary to the fibular origin, and is only found in 

 man and one or two of the anthropoid apes. (Macalister.) 



