REGIONAL ANATOMY 25 
to join with the coronary circle in forming the circumflex 
artery of the coronet. 
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 corone. 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 Prepuantar (Uncuau*) Arrery.—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 them- 
selves 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. 
Tue Puantar (Uncuat*) 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. 
* 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. 
