39 



The solar plesus is made up of a large nuinber of small veins, 

 ■wHch. unite to form the large circumflex vein which accompa- 

 nies the artery of the same name, passing back to the wing of 

 the OS pedis and thence to the coronary plexus. 



The laminal plexus arises on the sensitive laminae, the veins of 

 which gradually increasing in size as they approach the coronet 

 where they terminate in the coronary plexus. The coronary 

 plexus surrounds the os coronce and upper part of the os pedis, 

 extending backward below the lateral cartilages and is formed 

 by the veins of the solar and laminal plexuses. The veins of the 

 frog extend over the external surface of the sensitive frog, 

 ascending the sides of the lateral cartilage and unite to form a 

 large vein, which, with branches from the coronary plexus, runs 

 up the side of the os coronce, all uniting near the upper part of 

 the bone to form the digital vein. The internal or interosseous 

 veins of the foot originate at the circulus artei'iosas; they pass 

 out of the bone through the plantar foraminse, thence up the 

 inner side of the lateral cartilages and unite with branches of 

 the coronary plexus. 



NBEVES OP THE FOOT. 



At the fetlock each metacarpal and metatarsal nerve divides 

 into three digital branches; anterior, middle, and posterior. 



The anterior branch descends in front of the digital vein and 

 distributes its. branches on the anterior surface of the foot. 



The middle branch frequently anastomoses with the others, 

 and always with the anterior branch. It supplies the fetlock 

 pad and sensitive sole. 



The posterior branch, by far the larger, and the true continua- 

 tion of the metacarpal and metatarsal nerve, is continued behind 

 the digital artery to the vnng of the os pedis, entering the fissure 

 and being distributed to the substance of the bone and the 

 laminse. It gives off branches to the flexor tendons and a fila- 

 ment which is carried forward and distributed to the sensitive 

 frog; minute filaments accompany the plantar ungual artery into 

 the pedal bone. 



ANATOMY OF THE LYMPHATIC SYSTEM. 



The lymphatic or absorbent system is connected with the vas- 

 cular, and consists of a series of tubes which absorb and carry to 



