320 DR. GADOW ON THE ANATOMY OF PTEROCLES. [Mar. 21, 



passes between the two principal branches of the ischiadic 

 nerve, and is supported by the descending tendon of the m. 

 S5emitendinosus = m. caudae ilio-flexorius. 

 /j. This head is the larger of the two, and is the most super- 

 ficial one at the hinder and external aspect of the leg, as it 

 arises from the external condyle of the femur. The " tendo 

 communis" of these four heads is inserted into the hinder 

 margin of the tarso-rnetatarsal bone, but principally into the 

 tibial and median margin. 



The m. extensor diyitorum communis appears after the removal of 

 the superficial peroneal and of the tibialis muscle, being completely 

 covered by the latter. It arises from the anterior plane of the head 

 and neck of the tibia ; its tendon passes through the transverse liga- 

 ment and the bony bridge just above the intertarsal joint ; it then 

 runs down on the anterior surface of the metatarsal bone, and sends 

 a tendon to the dorsal part of the bases of the phalanges of the 

 three front toes. The mode of splitting up of the common tendon 

 into the special tendons and of their insertion varies much. 



M. j)erforatus digiti ii. — This muscle appears after the removal 

 of the most superficial of the flexor muscles on the outer side of the 

 leg. It comes with fleshy fibres from the ligam. fem. tibiale 

 externum and from the hinder part of the neck of the tibia. Its 

 long and slender tendon, after crossing the legs, passes right through 

 the susceptaculum in the middle of the hinder aspect of the inter- 

 tarsal joint, where it lies deeper than all the other tendons. It is 

 inserted into the ventral side of the phalanges ii. et iii. digiti ii. 



M. perforatus digiti iii. consists of two very fleshy heads. The 

 outer one is completely fused with that of the m. perforatus dig. ii. ; 

 it arises partly from the external condyle of the femur and from the 

 tendinous loop ; one part of this head forms the continuation of the 

 tendon of the ambiens muscle. Tlie inner head arises with a distinct 

 tendon from the hinder aspect of the middle part of the intercondy- 

 loid region. 



The combined tendon of the whole muscle, when passing over the 

 intertarsal joint, is quite flat, and lies between the susceptaculum and 

 the broad tendon of the gastrocnemius muscle. Thus in this region 

 it is the most superficial of all the flexor tendons. At the middle 

 of the metatarsal bone the tendon gives off a slip to that of the m. 

 perforans et perforatus dig. iii. 



M.Jlex. perforatus dig. iv. — Its thick belly arises from the hinder 

 aspect of the external condyle of the femur and from the intercon- 

 dyloid region. Its tendon, simply covered by the tendo Achillis, 

 passes as the most superficial one over the joint and is inserted into 

 the basis phal. ii. dig. iv. 



The m. flex, perforans et perforatus dig. iii. arises with a long 

 slender head together with the m. perforatus dig. iii. and with the 

 m. perforatus dig. ii. ; its tendon sends a slip to that of the m. per- 

 foratus, which it also perforates, and is inserted into the has. phal. 

 II. et III. dig. III. ; on the other hand, this tendon is pierced by that 

 of the m. flexor profundus. 



