264 



FASCIA AND MUSCLES OF THE HORSE 



anterior extensor of the phalanges; extensor pedis). — This muscle lies external to 

 the foregoing, which it resembles in general form, although less bulky. 



Origin. — (1) The front of the distal extremity of the humerus, just external to 

 the coronoid fossa; (2) the external tuberosity on the proximal extremity of the 

 radius, the external lateral ligament of the elbow, and the external border of the 





Brachialis 



Cephalic vein 

 Flexor carpi inter nus 



A nterior or common extensor of digit 



Extensor carpi obliquus 



''^ 



Metacarpal tuberosity 



Tendon of anterior extensor 

 Tendon of lateral extensor 



Branch of siispensory ligament to extensor 

 tendon 



Lateral cartilage 



Fig. 190. — Muscles of Lei't Thoracic T,imb op Horse, from Elbow downward, Anterior View. 

 a, Extensor carpi radialis; g' , suijerficial pectoral muscle. (After Ellenberger-Baum, Anat. fiir Kdnstler.) 



radius at the junction of its proximal and middle thirds; (3) the external surface 

 of the shaft of the ulna; (4) the fascia of the forearm. 



Insertion. — (1) The extensor (or pyramidal) process of the [third phalanx; (2) 

 the anterior surface of the proximal extremities of the first and second phalanges. 



Action. — To extend the digital and carpal joints, and to flex the elbow joint. 



Structure. — The muscle is a compound one, representing the common extensor. 



i 



