552 



THE 



larger tban tho preceding, this vessel (Fig. 278, 3) may bo considered as a 

 continuatiou of the primitive pedal artery. It in lodged tit fir.st in ihr 

 fissure situated outside tho middle mctatarsal bune, in front of the external 

 niotatarsal bone, and afterwards passes between these two bones, above the 

 tubercle terminating tho latter, reaching tho posterior face of the first, 

 between tho two inferior branches of tho suspensory 

 ligament, above the sesamoid groove, where tho vessel 

 bifurcates to form the collateral artcrieg of the digit. 



The collateral artery of the cannon receives, a short 

 distance above this terminal bifurcation, the internal 

 plantar interosseous artery. 



On its course it gives off: 1, Numerous anterior 

 ramuscules for tho cellular tissue, tendons, ligaments, 

 and tho skin on the anterior face of tho metatarsus and 

 fetlock ; 2, Some thin posterior divisions, one of which 

 ascends within the external metatarsul bone to anastomose 

 with the external plantar iuterosseous artery, after fur- 

 nishing several ligamentous, tendinous, and cutaneous 

 ramuscules in the posterior metatarsal region. 



DIGITAL ARTEBIES, OB COLLATERAL AHTERIES OP THE 

 DIGIT (Figs. 277, 25; 278, 4; 283, 11). Remarkable 

 for their volume, these arteries carry blood to the 

 keratogenous apparatus enveloping the ungueal phalanx, 

 and from this destination derive such importance that 

 they deserve a detailed study. 



Origin. The digital arteries succeed tho terminal 

 extremity of the collateral of tho cannon, and separate 

 from one another in forming an acute angle below tho 

 sesamoid venous arch, above tho fetlock joint, between 

 the two branches of the suspensory ligament, behind the 

 inferior extremity of the principal metatarsal bone, and 

 in front of the flexor tendons of the phalanges. 



Course and Relations. These vessels descend, one to 

 the right, the other to the left, from tho lateral ports of 

 the metacarpo-phalangeal (and metatarso-pJialangeal) 

 articulation to the internal face of tho basilar process, 

 PRINCIPAL ARTERIES w jj ere ^ ney bifurcate to form the plantar and preplantar 



AND VEINS OF THE T . 



POSTERIOR FOOT. 9 U 1 ***** , 



1 Anterior tibial ar- " I n tue whole of this course, it (tho digital artery) 



' tery ; 1', Pedal ar- follows the track of the flexor tendons, on whose margin 



tery ; 2, Perfora- it rests, and where it is maintained by loose connective 



ting pedal artery ; tigg^ Behind, it is flanked by the plantar nerve, which 



3, Metatarso-pedal, 



or collateral artery 



of the cannon; 4, 



Digital artery ; 5, It would have been better to have allowed it to retain the name 



Anterior tibial ar- given to it by Girard tho lateral artery of the cannon. This is 



tery ; 6, Posterior not the only instance in which the attempts of lligot to conform the 



root of the internal nomenclature of the arteries to that of authropotomists has proved 



saphena vein ; 7, unfortunate, as he has not always succeeded in finding in the 



Origin of the ex- Horse the real representatives of arteries in Man. The aim of 



ternal saphena vein; this work does not allow us (o discuss tho vicious determinations 



8, 9, 10, Metatarsal and denominations of lligot every time we meet them. We 



veins; 11, Digital are content to change them, purely and simply, leaving to the 



vein; 12, Venous judgment of the reader, should this matter iutercst him, the task 



plexus of the foot, of deciding if wo nre right. 



