74 DISSECTION OF THE CAT 



ball. It consists of folds of conjunctiva, strength- 

 ened by a cartilage at its free margin. 



5. The Harderian Gland is a small gland situated 

 on the nictitating membrane. 



6. The Lachrymal Gland lies in the upper and 

 outer part of the orbit, between the wall of the or- 

 bit and the eyeball. Its duct opens on the inner 

 surface of the upper eyelid, just above the outer 

 canthus. 



Remove the zygomatic arch and the underlying 

 tmiscles, cut away the coronoid process of the 

 mandible, and expose the lateral siirface of 

 the eyeball, being careful not to disturb its at- 

 tachment. 



7. The External Rectus Muscle of the eyeball 

 arises from the wall of the orbit just external to 

 the optic foramen. It is inserted on the outer 

 (lateral) surface of the eyeball. 



8. The Inferior Rectus Muscle arises from the ven- 

 tral margin of the optic foramen, and is inserted 

 on the ventral side of the eyeball. 



9. The Inferior Oblique Muscle arises from the or- 

 bital process of the maxillary bone, and is inserted 

 on the eyeball, on its ventral and outer side, along 

 the edge of the external rectus muscle. 



10. The Internal Rectus Muscle arises from the in- 

 ner margin of the optic foramen and is inserted on 

 the inner side of the eyeball. 



11. The Superior Rectus Muscle arises from the 



