26 VETERINARY OPHTHALMOLOGY. 



fibers being attached to the bony wall. There are 

 certain bundles of the orbicularis fibers— involuntary 

 — known as the ciliary muscle of Hiolini. The orbicu- 

 laris is adherent to the skin, but glides smoothly and 

 loosely over the tarsus. The contraction of this muscle 

 closes the palpebrse. 



The Levator PaJpehrm Sux>erioris arises at the 

 orbital apex, passing along the upper wall, becoming 

 intermingled with the orbicularis in front of the tarsus. 

 Some fibers go to the conjunctiva, while some become 

 attached to the upper edge of the tarsus. Supplied by 

 the motor-oculi. Function to raise the lid. The lower 

 lid is supplied by a prolongation from the inferior 

 rectus. 



The Tarsi. — The framework of the lids, being united 

 together and to the adjacent bone by the internal and 

 external lateral ligaments, gives rigidity and stabil- 

 ity to the eyelids. Composed of fibrous condensed 

 tissue. 



The Shhi adheres intimately to the orbicularis 

 muscle ; smooth and covered with numerous fine short 

 hairs. In the foetus, at the orbital arch, where the 

 skin everywhere else is without hair, we find a well 

 marked eyebrow. Fat is never found beneath this 

 skin. 



The Conjunctiva is a delicate mucous membrane, 

 which commences at the free border of the lid where it 

 is continuous with the skin. It lines the inner surface 



