THE MUSCLES OF THE LOAVER EXTREMITY. 227 



nomenclature, and oftentimes, in the present state of 

 our knowledge of sucli matters, a certainty of diagnosis 

 in homology is simply out of the question. 



In distinguishing the flexors I will bestow such names 

 upon them as will show their methods of insertion ; 

 for instance, the ijerforated tendons inserted into the 

 hasal phalanges will bear the name of primus, with the 

 name of the particular toe. In this last designation we 

 will call the second toe indicis, as it corresponds to the 

 index of manus ; and if occasion calls for it, we will 

 designate the next toe as medius, and the outside 

 one as annidaris. It is unnecessary to say that the 

 term perforans refers to a tendon that 'perfoixUes ; and 

 perfoi^atus to one that is j^erforated. 



Now the perforated tendons of the second row of 

 phalanges had better be designated by the word secundus, 

 should they be sufficiently individualized as to warrant 

 their being described as belonging to separate muscles. 



It probably will not be necessary to use all these 

 names, and I simply throw them out as a suggestion, 

 though, as I say, if occasion requires it, the nomencla- 

 ture adopted will be ujDon this j)lan, and in the present 

 subject some of them will be brought into use. 



115. The tibialis posticus arises from the whole 

 length of the shaft of the fibula below the insertion of 

 the biceps jiexor cruris ; from the shaft of the tibia 

 for a little distance below it ; from the interosseous 

 membrane ; and the adjacent surface of the tibial shaft. 

 It is in intimate relation with the Jiexor perforans 

 digitorum pedis, which overlies its mesial portion, and 

 the two muscles in this situation blending by their 

 fibres. The tibicdis posticus is a long, subcylindrical 

 muscle, and passing directly down the leg, from the 

 origin just described, terminates in a strong tendon 



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