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 fasciz antibrachii is a slender muscle which lies along the posterior 
Fic. 305.—Mvuscues or ANTIBRA- 
CHIUM AND MAnuwts oF OX; 
LATERAL VIEW. 
a, Extensor carpi radialis: 6, 
extensor digiti tertii; c, extensor 
digitalis communis; d, extensor 
digiti quarti; e, ulnaris lateralis; 
f, extensor carpi obliquus; /’, ul- 
nar head of flexor carpi ulnaris; g, 
brachialis; A, interosseus medius 
or suspensory ligament; 7, flexor 
tendons; 7’, branch of h, to super- 
ficial flexor tendon; 8, olecranon; 
11, accessory carpal bone; 12’, 
(After 
Anat. fiir 
metacarpal tuberosity. 
Ellenberger-Baum, 
Kiinstler.) 
Fig. 306.—Muscies or AntI- 
BRACHIUM AND MANUS OF 
Ox; Meptia VIEw. 
a, Extensor carpi radialis; 
b, tendon of extensor digiti ter- 
tii; f, tendon of extensor carpi 
obliquus; g, brachialis; A, inter- 
osseus medius or suspensory 
ligament; 7, flexor tendons; 7’, 
branch of h; k, flexor carpi radi- 
alis; 7, flexor carpi ulnaris; m, 
superficial digital flexor. (After 
Ellenberger-Baum, Anat. fir 
Kiinstler.) 
border of the triceps and is not 
connected with the latissimus 
dorsi. 
IV. MUSCLES OF THE FOREARM 
AND MANUS 
A. Extrnsor 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 pollicis. 
There are three digital ex- 
tensors: 1. The common 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 (MI. extensor digiti ter- 
tii proprius) arises on the lateral 
epiccndyle, 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 extensor carpi obliquus resembles that of the horse. 
1It may be remarked that, in addition to the extension action, the common extensor approxi- 
mates the digits, while the others tend to abduct them. 
