THE MUSCLES OF THE LOWER EXTREMITY. 253 



the knee-joint, while it also arises hy a strong tendon, 

 common to it and the Jiexor perforatus indicis secundus 

 pedis, from the external aspect of the outer condyle of 

 the femur. 



" Finally, it is attached more or less by carneous 

 fibres down the shafts of the leg-bones to a point 

 below their middle, or rather the middle of the leg. 

 Below this the muscle terminates in a strong tendon, 

 which, taking an oblique course through the tibial 

 cartilage, passes as usual over the ankle-joint, through 

 the hypotarsus, and down the back of the tarso- 

 metatarsus. 



" In the foot it perforates the more superficial flexor 

 of the basal phalanx of the outermost of the two anterior 

 toes, then in turn bifurcates over the prebasal joint to 

 allow the deep flexor to pass through, these bifurcations 

 becoming the insertions of this muscle, and they are 

 attached to the sides of the shaft of the second joint of 

 the toe alluded to, or the external one of the two in 

 front. 



"As its name indicates, our next muscle, the flexor 

 pei'foratus indicis p>rimus p)edis, has its tendon at- 

 tached to the nether side of the basal phalanx of 

 the index digit, and consequently aids in bending 

 that toe. 



" Above, as a flat, long muscle, it comes off by a thin 

 tendon from the external surface of the outer femoral 

 condyle, arising with the flexor p>erforatus medius 

 secundus p>edis. 



"The flexor perforans digitorum profundus. This 

 muscle is deep to all the flexors, and is situated directly 

 on the posterior aspect of the tibia and fibula. It arises 

 by two heads, one from the upper part of the tibia im- 

 mediately below the overhanging rim of its summit. 



