MYOLOGY 83 



superficial of these (the superficial plantar tendon) might 

 with equal propriety be said to have its relationship 

 rather with the flexor digitorum longus. Each of these 

 layers sends four branches to the four lateral digits. 



In one specimen of Teonoma the superficial plantar 

 tendon sent a branch to each of the five digits. 



M. soleus (figs. 6, 17, 32) is the deepest one of the 

 Achillean muscles. It arises by a tendon from the caudal 

 part of the head of the fibula, and its distal tendon joins 

 the cranial border of the tendo calcaneus. 



In one specimen of Teonoma there was a thread-like 

 tendon arising from the medial shaft of the fibula, to which 

 a few fibers of the central portion of the ental belly of the 

 soleus were attached. 



M. popliteus (figs. 7, 17, 32, 33) has a very small, ten- 

 dinous origin from the lightly defined pophteal fossa 

 upon the disto-caudal portion of the lateral epicondyle 

 of the femur. Diverging and passing obhquely mediad, 

 its insertion is along the proximal third of the me ial 

 shaft of the tibia. 



The following three muscles constitute the deep flexors 

 of the calf. 



M. flexor digitorum longus (figs. 7, 33) has fleshy 

 origin along the second and third fifths of the medial 

 ridge of the tibia, partly deep to the popliteus. Its fibers 

 are bipennated onto its tendon, which passes along a groove 

 upon the internal malleolus of the ankle, divides, sending 

 one branch to the medial side of digit one, and a broader 

 one to join the superficial tendon of the flexor fibularis. 



M. flexor digitorum fibularis (flexor hallucis longus) 

 (figs. 7, 17, 18, 33) is a large muscle occupying most of the 

 space posteriorly between the tibia and fibula. Origin is 

 from the medio-caudal head of the fibula and the adjacent 

 portion of the tibial head, and from the medial border of 

 the fibula for two-thirds its length. Its tendon passes 



