29 



The solar plexus is made up of a large number of small veins, 

 wliich 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 xdexuses. The veins of the 

 frog extend over the external surface of the sensitive frog, 

 ascending the sides of the lateral cartilage and unite to fonn 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 oi" interosseous 

 veins of the foot originate at the circulus arteriosus; they pass 

 out of the bone through the plantar foramina?, thence up the 

 inner side of the lateral cartilages and unite with branches of 

 the coronary plexus. 



NERVES OF THE FOOT. 



At the fetlock each metacarpal and metatarsal nerve di^-ides 

 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 fcot. 



The middle branch fi'equently anastomoses with the others, 

 and always Tsith 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 -^ing of the os pedis, entering the fissure 

 and being distributed to the substance of the bone and the 

 laminae. 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. 



AX ATOMY OF THE LYMPHATIC SYSTEM. 



The lymphatic or absorbBnt system is connected with the vas- 

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



