lo THE SURGICAL ANATOMY OF THE HORSE 



will be found to run straight down the posterior border of the tuber 

 calcis. It should be carefully noted that the surface in this region is 

 straight, for a slight convexity of the surface of the postero-inferior 

 aspect of the hock would most probably indicate the presence of a 

 curb. 



Below the hock another tendon makes its appearance, and is easily 

 felt to be placed immediately in front of that of the perforatus. This is 

 the tendon of the perforans muscle, and it has resumed its former position 

 in front of the perforatus after leaving the tarsal sheath, to pass through 

 which it left the perforatus above the hock. 



Immediately below the hock on the antero-external aspect of the 

 limb two tendons may be clearly detected as being subcutaneous. The 

 tendon which is the nearer to the middle line is that of the extensor 

 pedis muscle. The other is the peroneal tendon. If the course of 

 each tendon be followed in the downward direction they will be 

 found to become united to one another about four inches below the 

 hock. 



The tendon of the peroneus should next be traced in the upward 

 direction, when it will be found to run obliquely upwards and back- 

 wards to gain the outer aspect of the hock joint, where it has already 

 been followed to the groove on the external malleolus of the tibia. 



On the inner and outer surfaces of the metatarsal region a groove is 

 felt which takes a vertical direction. These grooves are situate between 

 the large and small metatarsal bones. 



Along part of the groove between the large metatarsal bone and 

 the outer small metatarsal the large metatarsal artery runs, the position 

 of which may be ascertained by the pulsation of the vessel, which can be 

 detected without much difficulty. Tracing the vessel upwards, we find 

 that the peroneal tendon crosses it obliquely in passing from the groove 

 in the external tibial malleolus to its attachment to the tendon of the 

 extensor pedis. 



A tiny muscle runs in front of, and parallel to the tendon of the 



