37G 



HITCHCOCK'S ANATOMY 



Fia - 349 • fluid is uniformly distributed 



over the whole ball of the 

 eye, and the excess is carried 

 away from the eye by the 

 two lachrymal canals, which 

 commence at the two little 

 projections near the inner 

 angle of each lid of the eye, 

 appearing like minute black 

 specks. Both of these very soon 

 unite into a larger tube called 

 the nasal duct, (Fig. 349,) 

 which descends inwardly and 

 empties itself upon the nostrils. 



689. Eyebrows.— The 

 Eyebrows are projecting 

 arches of fat and skin, cov- 

 ered with short and thick 

 hairs which encircle the 

 upper portion of the 

 eye. They are provided 

 with muscles, so that 

 they can be made to 

 shade the eye more or 

 less perfectly, as ne- 

 cessity may require. 



630. Eyelids,— The 

 Eyelids are movable 

 membranous and mus- 

 cular coverings which 

 are placed directly up- 

 on the eyeball, and are 

 designed for protective organs against mechanical violence and 

 too powerful light. Their free edges are called Tarsal Carti- 



Where are the lachrymal canals and what do they carry? What is the nasal duct? 

 689. Describe the eyebrows. 690. What are the eyelids ? What are their edges made up 

 of? What glands directly in them ? 



Lachrymal Canals. 1, Puncta Lachry- 

 malia. 2, Cul-de-Sac at the Orbital End 

 of the Canal. 3, Course of each Canal to 

 the Saccus Lacrymalis. 4, 5, Saccus La- 

 cry mal is. 6, Lower Part of the Ductus 

 ad Nasum. 



Fig. 350. 



Front View of the Left Eye — moderately opened. 

 1, Supercilia. 2, Cilia of each Eyelid. 3, Inferior 

 Palpebra. 4, Internal Canthus. 5, External Can- 

 thus. 6, Caruncula lacrymalis. 7, Plica Semilu- 

 naris. 8, Eyeball. 9, Pupil. 



