CHAPTER IX. 
Plate XIV. — the muscles that r vise the eye-lids, and 
SPHINCTER OR CIRCULAR MUSCLES. 
Fig. 1. A front view of this muscle, named levator palpebrce su- 
uerioris: Fig. 2. a profile of the same in its natural position. This 
muscle arises within the orbit, and is inserted by a broad tendon 
into the upper eye-lid. Its name is expressive of its use. 
Fig. 3. Exhibits examples of sphincter muscles: a , a, the orbi¬ 
cularis palpebrarum , encircling the eyelid; it closes the eye, and 
compresses it with spasmodic force, when injured by particles of 
dust, Sec. b , the orbicularis oris, surrounding the mouth; its chief 
use is to contract the lips. 
