CHAPTER IX. 

 Tab. XIV. — the muscles that raise the eye-lids, and 



SPHINCTER OR CIRCULAR MUSCLES. 



Fig. 1. A front view of this muscle, named levator palpebrcB supe- 

 rioris : Fig. 2. a profile of the same in its natural position. This mus- 

 cle 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 orbicu- 

 laris palpebrarum, encircling the eyelid ; it closes the eye, and com- 

 presses it with spasmodic force, when injured by particles of dust, &c. 

 b, the orbicularis oris, surrounding the mouth ; it chief use is to con- 

 tract the hps. 



