HORSESHOEING. 



33 



we term this 



Fig 



tbej draw themselves together, or contract, as 

 action, — the foot is carried forward (extended). 



There are tivo flexor tendons of the 

 phalanges, — namely, the superficial 

 (perforatus tendon) and the deep 

 (perforans tendon). 



1. The superficial fiexor or per- 

 foratus tendon (Figs. 15, h, and 16, 

 a, h) lies behind, immediately imder 

 the skin, and covers the deep flexor or 

 perforans tendon. At the gliding sur- 

 face between the sesamoid bones (Eig. 

 15, /) it broadens, and forms a ring 

 or tube (Fig. 15, V) tlirough which 

 the perforans tendon (a'") passes, 

 while a short distance farther down it 

 bifurcates, or divides into two 

 branches (Figs. 15, V% and 16, &), 

 which terminate, one on either side, 

 partly on the inferior lateral borders 

 of the first phalanx and partly on the 

 fibro-cartilage of the second phalanx. 

 It acts simultaneously on the long and 

 short pasterns. 



2. The deep fiexor or perforans 



Right forefoot seen from behind: a, lower end of the 

 perforans tendon, cut through and hanging down, so 

 that its anterior surface is visible; a', lower expanded 

 end (plantar aponeurosis) of this tendon, which attaches 

 itself to the semilunar crest of the os pedis; a", shallow 

 groove which receives the slight elevation on the under 

 surface of the navicular bone; a'", piece of the perforans 

 tendon enclosed by the ring formed by the perforatus 

 tendon; 6, perforatus tendon bent over backward so that 

 its anterior surface ia v-isible; 6', ring of the perforatus tendon; h", terminal branches of 

 the same; the perforans tendon passes through the space between these two branches; c, 

 navicular bone; d, suspensory ligament of the same; e, smooth surface on the os coronse over 

 which the perforans tendon glides; /, the smooth groove (sesamoid groove) on the posterior 

 surface of the intersesamoid ligament for the gliding of the perforans tendon; g, body of the 

 suspensory ligament of the fetlock; g', terminal branches of the same, attaching to the sesa- 

 moid bones. 



