THE MUSCULAR SYSTEM 



55 



been handed down from the earlier anatomists, who gave them in a 

 haphazard manner. Some were based on form, location, and func- 

 tion; others have been adopted from human anatomy and do not 

 apply to quadrupeds, so there has been httle uniformity in muscle 

 terminology. 



\heath 



bursa^ 



.Mesoteitdm 



Synoi/lal sheath 



Fig. 10.— Diagram of cross-section of bursa (A) and tendon sheath (B) : 

 r, Tendon. For the sake of clearness the synovial sacs are represented as 

 somewhat distended. (Sisson, Anatomy of Domestic Animals.) 



In the following classification of the chief muscles of the fore 

 limb, which is given to illustrate the general arrangement of 

 muscles, the names are those given preference in Sisson's "Anatomy 

 of Domestic Animals": 



Flexor Muscles of the Elbow: 



1. Biceps brachii. 



2. Brachialis. 



Flexor Muscles of the Carpus: 



1. Flexor carpi radialis. 



2. Flexor carpi ulnaris. 



3. Ulnaris lateralis. 



Flexor Muscles of the Digit: 



1. Superficial digital flexor. 



2. Deep digital flexor. 



Extensor Muscles of the Elbow: 



1. Tensor fasciae antibrachii. 



2. Triceps brachii. 



3. Anconeus. 



Extensor Muscles of the Carpus: 



1. Extensor carpi radialis. 



2. Extensor carpi obUquus. 



Extensor Muscles of the Digit: 



1. Common digital extensor. 



2. Lateral digital extensor. 



In addition to these muscles of the fore limb, attention is 

 called particularly to the heavy muscles of the haunch and thigh, 

 where the propelling power of the horse lies. Notice is also directed 

 to the relation between the development of these muscles and the 

 conformation of the animal's body.' 



' Agricultural students whose time is limited need not be required to 

 describe each muscle in detail. Those who wish to go into the subject more 

 fully are referred to text-books on veterinary anatomy. 



