THE FORE EXTREMITY. 213 



■surface of tlie large metacarpal boue, receives a portion of 

 tendon from extensor pedis, and is liere termed liga- 

 jnentuni extensorum. After passing over tlie capsular 

 ligament of the fetlock -joint to which it is attached, it 

 becomes inserted into the supero-anterior and external part 

 of OS suffraginis. 



Flexor metacarpi externus, superiorly, is attached to the 

 -extreme posterior part of the ridge running from the ex- 

 ternal condyle of the humerus and to the capsular ligament 

 of the elbow-joint (being the only flexor of the forearm 

 which arises from the outer surface of the limb) ; it runs 

 downwards and inferiorly blends with the fibrous sheath 

 of extensor os suffraginis (which is here part of the 

 annular ligament of the knee), becoming inserted into the 

 superior margin of the trapezium, while it sends a small 

 round tendon through the groove running obliquely down- 

 wards and forwards on the external surface of this bone 

 ^which is lubricated with synovia), and passes to the head 

 of the outer splint bone. 



Remove the skin from the remainder of the limb as 

 far as the hoof, clean the tendons and ligaments thus ex- 

 posed by careful removal of the areolar tissue anteriorly ; 

 the tendon of extensor os suffraginis will be found arranged 

 as above indicated ; that of extensor pedis, after playing 

 over a large bursa at the antero-inferior part of the large 

 metacarpal bone, grows wider in becoming attached to the 

 front of the capsular ligament of the fetlock, receives on 

 each side a strong band running from the inferior extremity 

 of the superior sesamoideal ligament obliquely over the 

 lateral parts of the pastern bone, and becomes inserted into 

 a somewhat heart-shaped prominence on the anterior sur- 

 face of the coronal process of os pedis. It is firmly fixed 

 to the anterior surfaces of ossa coronse and suffraginis, and 

 of the capsular ligaments of the pastern and cofiin joints 

 by dense white fibrous tissue, and in the same way is united 

 on both sides of its extreme inferior part to the lateral 

 .cartilages. 



From the inferior margin of trapezium a portion of the 

 annular ligament runs to the supero-lateral part of the 

 •small external metacarpal bone ; it serves to protect the 

 jierves and blood-vessels of this neighbourhood. 



The radial artery breaks up into two vessels just at the 

 .superior suspensory ligament, the smaller, small metacarpal 



