LIGAMENTS AND MUSCLES OF THE HORSE. 45 



Insertion,-To the anterior and external part of the olecranon. 

 Action -The principal use of this small muscle is to raise the 



synovial membrane, and prevent injury to it in extension 



of the joint. 

 ANTERIOR ANTIBRACHIAL REGION. 



1 Extensor metacarpi magnus. 3. Extensor pedis. 



2* u " oUiquus. 4. " siiffrayims. 



Extensor metacarpi magnus. 



Oriqin -From the external condyle of the humerus. 

 Insertion. -To an eminence on the upper end of the large 



metacarpal bone, towards its inner side. 

 A(.tion.—To extend the metacarpus. 

 Note -Where the tendon passes over the anterior ligament ot 



the knee it is enclosed in a synovial sheath. 

 Extensor Metacarpi Obliquus. 



Origin -From the lower part of the outer border of the radius, 

 Insertion.-To the head of the inner small metacarpal bone. 

 ^,^^o„._Like the preceding muscle. 



Note -Where the tendon plays through the oblique groove at 

 the lower end of the radius, a small synovial bursa is m- 

 terposed. 



Extensor Pedis. 



Orinin-Bs a tendon (common to it and the large extensor) 

 from the external condyle of the humerus; also from the 

 external tuberosity of the radius, and external lateral 



ligament. 



hmrtion.-T^o the pyramidal process of the os pedis. 



Action.-T:o extend the foot (more exactly, it extends the cofiSn, 

 pastern, fetlock, and knee joints in succession). 



ifo^/-The fleshy part of the muscle consists of two unequal 

 portions, and these are succeeded by two tendons, p aced 

 close together. The outer and smaller of these (muscle ot 

 Phillips) joins the tendon of the extensor suffraginis. At 



