414 Harris Hawthorne Wilder, 



matecl to that of the fibular extensor, and in some cases it seeras 

 as though there was a direct connection between the two muscles. 



Arrived at the interdigital Spaces each of the the three main 

 slips divides distally into two. which insert by small tendons into 

 the lateral angles at the bases of two adjacent metatarsals. Thus 

 the two tendons of the most tibial slip snpply the fibular side of 

 digit II and the tibial side of digit III; those of the second the 

 fibular side of III and the tibial side of IV; and those of the third 

 the fibular side of IV and the tibial side of V. The accessory slip 

 passes to the outer (fibular) side of the origin of M. extensor brevis V 

 and there divides into two bundles, one of which inserts along the 

 distal edge of tarsale 4 -f- 5, along the sarae line frora which the 

 latter muscle takes its origin, the other into the outer (fibular) side 

 of the base pf nietatarsale V. This last slip thus completes on the 

 fibular side of the fifth metatarsal the series of tendons that supply 

 the lateral angles of the bases of the metatarsals and serve as ab- 

 and ad-ductors of the set. The tibial side of digit II alone remains 

 unsupplied from the femerometatarsalis System and the lack is 

 supplied by a special abductor, the supinator, thus rendering the 

 series complete. *) 



M. extensor tibialis (et). This is the very large mass of 

 muscles which lies on the tibial side of the leg partly covered by 

 the humerometacarpalis. After the removal of the latter it is seen 

 to almost entirely cover the dorsal surface of the tibia and to 

 extend at its proximal end so that it comes in contact with the 

 extensor fibularis. It is divided into two portions, with origins in 

 contact but with distinct insertions. The details are as follows: 



a) extensor tibialis superficialis (eis). This portion 

 arises from along the distal margin of the tibial condyle of the 

 femur. Almost as soon as the tibia is reached the deepest fibers 

 of this portion begin to insert along its free margin and continue 

 down the entire length of the bone. The remaining fibers pass 

 under the margin of M. supinator and insert in two bundles, into 

 the marginal and dorsal aspects of tibiale and tarsale II respectively. 

 The most superficial of the fibers of this muscle are the longest, 

 and consist of those that insert into tarsale II; beneath these lie 

 the fibers that insert into the tibiale, and the deepest of all are 

 those that insert into the tibia. 



1) For the treatment of this muscle by various authors cf. sub H. 

 humerometacarpalis, the corresponding muscle in the arm. 



