352 



THE MUSCLES OF THE OX 



The medial head of the triceps is more developed than in the horse, and ex- 

 tends up to the neck of the humerus. 



The tensor fasciae antibrachii is a slendc^i- muscle which lies along the posterior 



border of the triceps and is not 

 connected with the latissimus 

 dorsi. 



Fig. 305. — Mvscles of Axtibra- 



CHIUM AND ManUS OF Ox; 



Lateral View. 



a. Extensor carpi radialis; 6, 

 extensor digiti tertii; c, extensor 

 digitalis communis ; d, extensor 

 dioiti quarti; e, ulnaris lateralis; 

 /, extensor carpi obliquus; /', ul- 

 nar head of flexor carpi ulnaris; g, 

 brachialis; h, interosseua medius 

 or suspensory ligament; i, flexor 

 tendons; i', branch of h, to super- 

 ficial flexor tendon; 8, olecranon; 

 11, accessory carpal bone; 1B\ 

 metacarpal tuberosity. (After 

 EIlenberger-Baum., Anat. filr 

 Kiinstler.) 



/ 



^^^■^ 



Fig. 306. — Muscles of Axti- 



BRACHIUM AND MaN'US OF 



Ox; Medial View. 



a, Extensor carpi radialis; 

 b, tendon of extensor digiti ter- 

 tii; /, tendon of extensor carpi 

 obliquus; (7, bracfiialis; A, inter- 

 osseus medius or suspensory 

 ligament; i, flexor tendons; i', 

 branch of h; k, flexor carpi radi- 

 alis; I, flexor carpi ulnaris; m, 

 superficial digital flexor. (After 

 EIlenberger-Baum, Anat. fiir 

 Kiinstler.) 



IV. MUSCLES OF THE FOREARM 

 AND MANUS 



A. Extensor Division 

 The extensor carpi radialis 



is like that of the horse. There 

 is sometimes a small muscle 

 lying along its medial border, 

 which may represent the exten- 

 sores polhcis. 



There are three digital ex- 

 tensors: 1. The conmion digital 

 extensor (M. extensor digitalis 

 communis) arises by two heads 

 from the lateral epicondyle of 

 the humerus and from the ulna. 

 The heads fuse about the middle 

 of the forearm, and terminate 

 soon on a tendon which passes 

 over the carpus and metacarpus, 

 gradually inclining forward. At 

 the fetlock joint it divides into 

 two branches, each of which is 

 inserted into the extensor pro- 

 cess of the corresponding third 

 phalanx. 2. The medial digital 

 extensor (M. extensor digiti ter- 

 tii proprius) arises on the lateral 

 epicondyle, and is inserted by 

 two branches into the second 

 and third phalanges of the me- 

 dial digit. The tendon receives 

 two reinforcing slips from the 

 suspensory ligament. 3. The 

 lateral digital extensor (M. 

 extensor digitalis lateralis s. 

 digiti quarti proprius) is stronger 

 than that of the horse; it arises 

 from the lateral ligament of the 

 elbow joint, the lateral tuber- 

 osity of the radius, and the 

 ulna. The tendon terminates 

 like that of the preceding 

 muscle.'- 

 the horse. 



The extensor carpi obliquus resembles that of 



1 It may be remarked that, in addition to the extension action, the common extensor approxi- 

 mates the digits, while the others tend to abduct them. 



