88 



DISSECTION OF THE DOG 



I ___ a, saphena 

 'Ramus dorsalis 



a. tibialis anterior. 

 Ramus superflcialis ' 



, -a. tibialis anterior 



a. dorsalis pedis 



FiQ. 34. — Diagram of the arteries on the dorsum of the pes. 



metatarsus and digits are 

 derived from two sources, the 

 saphenous and anterior tibial 

 arteries. 



The saphenous artery (a. 

 saphena) divides into plantar 

 and dorsal branches. The 

 dorsal branch arrives at the 

 flexor aspect of the tarsus and 

 there divides, in its turn, into 

 medial and lateral branches. 

 The medial branch forms the 

 second dorsal common digital 

 artery (a. digitalis communis 

 dorsalis II) ; and the lateral 

 branch furnishes the corre- 

 sponding third and fourth 

 arteries. The common digital 

 ty^oo. digitaies donates vessels travel distalwards in 



->"* communes 



the grooves formed by the 

 metatarsal bones and end, at 

 the distal part of the meta- 

 tarsus, by dividing each into 

 two 'proper digital arteries 

 (aa. digitales propria dorsales) 

 distributed along the dorsal 

 borders of adjacent digits. 



The skin on the fibular side 

 of the pes is supplied by the 

 superficial branch of the an- 

 terior tibial artery. A full 

 consideration of this vessel 

 should be deferred until later. 



Nerves of the dorsum or 

 the pes. — The nerves of the 

 region are derived from the 

 superficial and deep peroneal 

 nerves. The superficial peroneal 

 nerve (n. peronseus superflcialis) 

 appears by piercing the deep 

 fascia in the peroneal region a 

 little above the tarsus. It 

 supplies the medial dorsal 



an. mrtatarstce 

 Z?' dorsales 



