THE ECONOMY OF THE MUSCULAR COVERING. 



71 



The muscular covering of the frontal and nasal bones is not promi- 

 nent and docs not require mention here. 



Muscles of the Nose and Lips. — The muscles of the nose and lips are 

 important, since on them depend the act of gathering food, and also the 

 expansion and contraction of the nostrils in breathing. They are also 

 ^ Tig. 1. 



Cut 3. — Muscles ok the Head and Neck 

 an index, together with those of the ears, in discovering much of the 

 temper of the horse. Orhiciilansoris (e) is one of the most important 

 of these. It entirely surrounds the mouth, and by its action closes or 

 opens the lips. A pyramidal muscle (dilator naris lateralis) (/) covers 

 the whole of the nostril, and also raises the upper lip. 



The muscle sho^vn at h (7iasalis lahii superioris) extends from a de- 

 pression in front of the eye towards the angle of the mouth and divides 



