r.\n-:i;\.\i. u.i.\< .1 ////:/,//> 555 



fissure, which it crosses from Ix-foru to behind, and t miniates near its 

 ior < -xtivmity by several divisions that bury themselves in the us 

 pedis. In its course, it distributes: 1, Before passing into the sub-basilar 

 notch, a deep retrograde branch deetined to the -bulb of the heel and the 

 villous tissue; 2, Immediately after leaving that notch, a second retrograde 

 branch. whose divisions pass backward, behind the great circumflex artery of 

 the pedal lone ; 3, During its passage in the preplautar fissure, several ascend- 

 ing and descending branches which ramify in the laminal tissue; the first 

 anastomose with the descending divisions of the coronary circle and the 

 circumflex artery of the coronary cushion. 



b. Tho 2'litt">' inigueal artery ought to bo regarded as a continuation of 

 the digital artery, because of its volume and direction. Lodged at first, 

 with a fine nervous branch, in the plantar fissure, it afterwards enters the 

 canal of the same name, and thus penetrates into the semilunar sinus of the 

 os pedis. where it anastomoses by inosculation with the opposite artery, 

 forming a deep vascular arcade which we designate the plonlar arcade or 

 c/'/vA', or, after M. H. Bouley, the semilunar anastomosis (Fig. 283, 12). 



Two orders of branches emanate from the convexity formed by this 

 anast miotic loop. The ascending order " irradiate in the spongy framework 

 of the third phalanx, and like so many hair-roots, escape by numerous open- 

 ings from its anterior face, where they form a very intricate plexus by anasto- 

 mosing, in the texture of the lauiinal tissue, with the extreme divisions of the 

 anterior branch of the digital artery and those of the coronary circle ..... 

 It is to these divisions that Spooner has given the name of anterior laminal 

 nrfi-ries." H. Bouley. 



The descending order, much more considerable, named by Spooner (W. C., 

 of Southampton) the inferior communicating arteries, arise at a right angle from 

 the anterior circumference of the semilunar anastomosis, traverse in a diver- 

 gent manner the tissue of the phalanx, and make their exit by the large fora- 

 mina situated a little above the inferior border of the bone, where they furnish 

 a multitude of ascending ramuseulcs which concur to form the arterial net- 

 work of the laminal tissue. " Then they anastomose transversely by a 

 Q of little arcades which are thrown from one to the other, and in 

 this way give rise to a great circumflex canal which follows the contour of the 

 parabolic curve exhibited by the thin border of the os pedis, on its inferior 

 face '' II. Bouley. This vascular arcade, which wo purpose naming the in- 

 '/mjli.i: f/j-/< /////////"./. to distinguish it from the circumflex of the 

 coronary cushion, is joined by its extremities to the preplantar artery, in the 

 same manner that the latter circumflex is united to the artery of the plantar 

 cushion. From its concavity it throws off some fourteen or fifteen con- 



rent branches, which are destined to the villous tissue of the sole. 



!A1, i 11 AKACTEH8 OF THE EXTI.ItNAI, I I.I ACS IN oTIIKU THAN BOL1PED ANIMALS. 

 1. Kft> null Ili'ii- . I .' -iitiifintg. 



Ill t\i>- Of, n purl from tin- co!i>i.lcral>le volume uf tin- grt-nt n.usoul'ir arteries of tin 

 tlii.L'li, tli>- crural trunk, as well in the f<-iinir:il aii'l |N>|i!it.-al arteries i-otitiimim; it, 

 . es alni".-t tl.e Mini" iis ill tin* IIi'i-!'. It i- nly \vln-:i we n sn-li the 

 rior lil'inl in-!- i !' * tlnit we lind .-iur \> mliaiitics worthy <f nntiee. 



i. Mm-': i n ior \. liiin!ii"U- tl.-.ui that "f S I ]> 'Is. thi>art- ry t'.illuws 



.ml terminate^ in un aMaln^niis iiiiiiim r : fc.nniiij? at its l.iwt-r extremity 



. which anastomose with the ] lal artery lii-himl the 



trriiiil v of the jiriiicipul meta!ai>:il lHie. ami boneata tl.- eni-iit. 



I Sut thi-.-e two lirancliert iire f.ir frc.iii the rani'- \"liuile; the internal is in- 



rahly tl.e lai-i >t, ami app .lit inuatioii ( .f th' 1 pusteri'T t l-i.il 



