EXTERNAL FOKM. 



Ixxix 



body. They are possessed of the property of contracting 

 under the influence of the will, and often independently of 

 it, and, by this contraction, of producing motion in the parts 

 with which they are connected ; and all the movements of 

 animals, from the smallest inflexion of the voice to the most 

 extended motions of the limbs, are produced by the contrac- 

 tile power of these organs. When they are to give motion 

 to bones, the fleshy part terminates in tendons, which are 

 attached like ropes or cords to the parts to be moved. The 

 muscles of the horse, as of other animals, may be divided 

 into classes, according to the functions which they have to 

 perform, or the parts of the body to which they pertain.* 



Fig. 6. 



The muscles belonging to the head are numerous. They 



The figure represents the principal external muscles, namely, 

 a Dilatator Naris Lateralis. 

 b ^ Nasalis Longus Labii Superioris. 

 c c Levator Labii Superioris Alaeque Xasi. 



