5. _Under the Lateral Cartilage_ two transverse branches, an anterior and a posterior, to form the _Coronary Circle_. The numerous ramifications of these branches anastomose both anteriorly and posteriorly with their corresponding branches of the artery of the opposite side. This circle closely embraces the os coronæ. Among the larger branches given off from its anterior portion are two descending, one on each side of the extensor pedis, to assist in the formation of the _Circumflex Artery of the Coronary Cushion_. The formation of this last-named artery is completed posteriorly by the before-mentioned branch from the artery of the plantar cushion. THE PREPLANTAR (UNGUAL[A]) ARTERY.--This, the smaller of the two terminal branches of the digital, is situated inside the basilar process of the os pedis. It turns round this to gain the fissure between the basilar and retrossal processes, and becomes lodged in the preplantar fissure. Here it terminates in several divisions which bury themselves in the os pedis. Before leaving the inner aspect of the pedal wing it supplies a deep branch to the heel and the villous tissue. Gaining the outer aspect of the wing, it distributes a further backward branch, which passes behind the circumflex artery of the pedal bone, and, during its passage in the preplantar fissure, gives off ascending and descending branches, which ramify in the laminal tissue. THE PLANTAR (UNGUAL[A]) ARTERY.--This, the larger of the two terminals of the digital, may be looked upon as a continuation of the main vessel. Running along the plantar groove, it gains the plantar foramen. Here it enters the interior of the bone (the semilunar sinus) and anastomoses with the corresponding artery of the opposite side. The circle of vessels so formed is called the _Plantar Arch_ or the _Semilunar Anastomosis_. [Footnote A: The epithet 'ungual' is added by Chauveau to distinguish these arteries from the properly so-called plantar arteries--the terminal divisions of the posterior tibial artery.] From the semilunar anastomosis radiate two main groups of arterial branches, an ascending group and a descending one. The _ascending_ branches penetrate the substance of the os pedis, and emerge by the numerous foraminæ on its laminal surface. The _descending_ branches, larger in size, also penetrate the substance of the pedal bone, and emerge in turn from the foraminæ cribbling its outer surface--in this case the set of larger foraminæ opening on its inferior edge. Having gained exit from the bone, their frequent anastomosis, right and left, with their fellows forms a large vessel following the contour of the inferior edge of the os pedis. This constitutes the _Circumflex Artery of the Toe_. E. THE VEINS. These commence at the foot with a series of plexuses, which may be described as forming (1) AN INTERNAL OR INTRA-OSSEOUS VENOUS SYSTEM, and (2) AN EXTERNAL OR EXTRA-OSSEOUS VENOUS SYSTEM.