184 MR WM. TURNER ON VARIABILITY IN HUMAN STRUCTURE. 



flexor tendon from it (figs. 3, 5, 8, 10). In these cases, therefore, the tendons 

 were doubly connected by intertendinous bands* 



The flexor accessorius varied greatly in its mode of termination on the flexor 

 tendons. In but a few instances (fig. 5, for example) could it be said to end in 

 the manner usually described in the text-books, by joining the outer border and 

 upper, and sometimes the under surface of the tendon of the flexor communis. 

 In many cases it had no connection whatever with the outer border of that tendon ; 

 in several of these it contributed no fibres to the tendon for the little toe, and in 

 a few it had no connection with the tendons for the fourth and fifth toes. In 

 other cases, however, it gave off a distinct tendinous or musculo- 

 tendinous bundle, sometimes of considerable size, to the deep 

 tendon for the little toe (figs. 3, 6, 7). In a few cases the deep 

 flexor tendon for that toe was almost entirely (fig. 10), and in 

 one case (fig. 8) apparently, entirely formed of a tendon pro- 

 ceeding from the flexor accessorius, the common flexor tendon 

 sparingly in the former (fig. 10), and not at all in the latter 

 case (fig. 8), entering into its construction. In most cases the 

 accessory flexor ended partly on the flexor communis, and 

 partly on the connecting slip from the flexor hallucis, and 

 through one or both of these contributed materially to the 

 formation of the deep tendons for the second, third, and fourth toes. In one case 

 it sent, in addition, a few fibres to the primary tendon of the flexor hallucis, and 

 in another all its fibres terminated on the connecting slip, and through it were 

 transmitted to the deep flexor tendons of the second and third toes. In one case 

 it gave oft' a distinct slip, which, separating into two parts, gave one to each process 

 of bifurcation of the tendon of the flexor brevis digitorum for the third toe. 



In two cases the flexor accessorius had an accessory muscle connected to it, 

 which arose from the deep fascia of the back of the leg in its lower third, conceal- 

 ing at its origin the posterior tibial vessels and nerve. It passed downwards, and 

 ended in a rounded tendon, which extended through the inner ankle beneath the 

 abductor pollicis, and joined the inner margin of the flexor accessorius (fig. 9)4 



* It would almost appear as if some of the systematic writers of the last century had recognised 

 the band proceeding from the flexor communis to the flexor hallucis, but not the one passing in the 

 opposite direction. Vide Albinus, Winslow, Tarin, Sandifort, and Douglas. Several of the 

 more recent writers have described an arrangement similar to the one recorded in the text. — Vide 

 Sabatier, Arnold, and Theile. 



f Fig. 8 shows the deep flexor tendon for the little toe entirely formed of the flexor accessorius. 

 The flexor communis, after sending off a connecting band to the flexor hallucis, trifurcates for the 

 second, third, and fourth toes, to which the connecting band from the flexor hallucis also proceeds. 



I The two specimens described in the text were found amongst the fifty specimens specially 

 analysed, but I have in former years, and in other subjects, met with additional instances of an 

 accessory muscle in this locality. The region of the inner ankle appears, indeed, to be frequently the 

 seat of such accessory muscular structures, e.g. 



