THE MUSCULAR SYSTEM 



57 



gave them in a haphazard manner. Some were based on form, 

 location, and function; others have been adopted from human 

 anatomy and do not apply to quadrupeds, so there has been 

 little uniformity in muscle terminology.. 



Tihrous sheath 



2/fesotaidat 



fibrous sheath. 



^Synovial sheath 



A B 



Fig. 13. — Diagram of cross-section of bursa (A) and tendon sheath (B): 

 T, Tendon. For the sake of clearness the synovial sacs are represented as some- 

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



In the following classification of the chief muscles of the fore 

 limb of the horse, which is given to illustrate the general arrange- 

 ment of muscles, the names are those given preference in Sisson's 

 "Anatomy of the 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 Elbou): 



1. Tensor fasciae antibrachii. 



2. Triceps brachii. 



3. Anconeus. 



Extensor Muscles of the Carpus: 



1. Extensor carpi radialis. 



2. Extensor carpi obliquus. 



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 lies. Notice is also directed to the relation 

 beween the development of these muscles and the conformation 

 of the animal's body. 1 



1 Those who wish to go into this subject more fully are referred to text- 

 books on veterinary anatomy. 



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