358 



LACHRYMAL APPARATUS. 



FIG. 104. 



sometimes occurs when this secretion becomes glutinous 

 from disease. 



Blood-vessels. The eyelids are supplied with arteries by 

 the palpebral branches from the ophthalmic, internally, 

 and by the facial, transverse facial, and infra orbital, ex- 

 ternally and inferiorly. The nerves come from the fifth 

 and the facial. 



Lachrymal Apparatus. This apparatus (Fig. 104) consists 

 of a variety of parts -first, of a gland to secrete the tears ; 



second , tubes to carry 

 the tears to the eye; 

 third, puncta lachry- 

 malia and lachrymal 

 ducts, to carry this 

 fluid from the eye into 

 fourth, the lachrymal 

 sac, whence it reaches 

 the nose by fifth, the 

 nasal duct. The lach- 

 rymal belongs to the 

 conglomerate division 

 of glands, and is situ- 

 ated at the upper and 

 outer angle of the or- 

 bit, occupying the lachrymal fossa in the orbital plate of 

 the frontal bone. 



This gland is of a pale reddish color, consisting of two 

 lobes, a superior or orbital, and an inferior or palpebral, 

 having a covering of cellular structure. The orbital is the 

 larger portion, being about three quarters of an inch in 

 length, and half an inch in breadth. Its upper portion is 

 convex, and in relation with the periosteum of the orbit ; 

 its lower is concave, and in relation with the superior and 



FIG. 104 represents the Lachrymal Apparatus, a Tarsal cartilage of the 

 upper lid. b Tarsal cartilage of the lower lid, and the opening along the mar- 

 gins are those of the Meibomian glands, c Caruncula laehrymalis. d Lachry- 

 mal gland, e Puncta lachrymalia. // Lachrymal ducts, g Lachrymal sac. 

 h Nasal duct, i Where it terminates in the inferior meatus of the nose, j 

 Inferior turbinated bone. 



