DEEP LAYER OF MUSCLES. 



611 



soleus ; but in the lower half it is in contact with the fascia, and the pos- 

 terior tibial vessels and nerve lie on it. The deep surface rests on the 

 tibia and the tibialis posticus. 



Action. The muscle bends the farthest phalangeal joints of the four 

 smaller toes, and then extends the ankle. 



Fig. 209. 



Muscles : 



A. Popliteus. 



B. Outer, and c, inner part of soleus, cut. 



D. Tibialis posticus. 



E. Flexor digitorum. 



F. Flexor pollicis. 



0. Peroneus longus. j 

 H. Peroneus brevis. * 



1. Tendo Aehillis. 



Arteries : 



a. Popliteal. 



b. Inferior internal, and c, inferior external articular. 

 d. Anterior tibial. 



. Posterior tibial, and /, its communicating branch to 



peroneal. 



g. Peroneal artery. 



h. Continuation of peroneal to outer side of the foot. 

 Nerves : 



1. Internal popliteal. 



2. Muscular branch of posterior tibial. 



3. Posterior tibial. 



4. Cutaneous plautar. 



O 



bO 



JD 



"5 

 O 



13 

 o 



CD 

 2 



DEEP DISSECTION OF THE BACK OF THE LEO (Illustrations of Dissections). 



If the toes are in contact with the ground, the flexor helps to raise the 

 heel in walking ; and to move back the tibia in the act of rising from 

 stooping. 



The TIBIALIS POSTICUS (fig. 209, D ) occupies the interval between the 

 bones of the leg, but it crosses over the tibia inferiorly to reach the inner 

 side of the foot. The muscle arises from an aponeurosis superficial to it, 

 and from the interosseous membrane, except about one inch below : from 

 an impression along the outer border of the tibia, which reaches from the 

 head of the bone to rather beyond the attachment of the flexor longus 

 digitorum ; and from the adjacent inner surface of the shaft of the fibula 



