362 ZOOTOMY. 



fl.d.c^, its tendon to the second digit, in great part removed to bhow the 

 interossei : j^.o'.c", its tendon to the fifth digit: i.o, interossei : Ib.i, 

 Ib.z, Ib.-i, lumbricales : //, plantaris : pP, its tendon to the second digit, 

 partly removed and with its distal end reflected : pi*, its tendon to the 

 fourth digit, partly removed, and having the sheath it forms over the 

 metatarso-phalangeal articulation slit up and reflected right and left : 

 pr.b, peroneus brevis : pr.d.i,, peroneus quarti digiti : pr.d.e,, peroneus 

 quinti digiti : pr.l, peroneus longus : t.ach, tendo Achillis, inserted into 

 the calcaneum : tb.a, tibialis anticus : ti, tibia. 



muscle forming the posterior surface of the shank : its 

 inner head (qs^) arises from the inner condyle of the 

 femur and pre-axial fabella (§ 94), its outer head {gs^) 

 from the outer condyle and post-axial fabella : the two heads 

 unite with one another and with the soleus (§ 461) to form 

 a large strong tendon, the tendo Achillis, which is 

 inserted into the extremity of the calcaneum. 



461. The soleus {so), a small muscle seen by turning 

 aside the outer head of the gastrocnemius ; it arises by a 

 long tendon from the head of the fibula, and joins the 

 gastrocnemius to form the tendo Achillis. 



462. The plantaris (//), a large muscle, the proximal 

 fleshy part of which is enwrapped by the gastrocnemius, from 

 which it must be carefully separated ; by dividing and 

 reflecting the gastrocnemius and soleus, the plantaris is seen 

 to arise from the posterior surface of the femur immediately 

 proximal to the outer condyle and from the post-axial fabella : 

 at about the middle of the crus it passes into a strong flat 

 tendon, which curves round to the posterior side of the tendo 

 AchiUis and over the end of the calcaneum to reach the sole 

 of the foot : the tendon divides into four slips, which are 

 related to the digits in the same way as those of the flexor 

 sublimis to the digits of the manus (§ 425) : divide and 

 reflect. 



463. The popliteus (//), or rotator of the knee, lying 

 obliquely across the back of the knee-joint : it arises by 



