358 HUMAN ANATOMY. 



The anterior portion of the gland is sometimes described 

 as a separate lobe the palpebral portion of the gland, or ac- 

 cessory gland of Rosenmiiller. 



The gland is attached to the bony roof of the orbit by the 

 tarso-orbital fascia. 



The ducts, seven to ten in number, open upon the con- 

 junctiva near its point of reflection by minute orifices arranged 



in a row. 



The lachrymal canals commence at the puncta lachrymalia, 

 at the summits of the papillae lachrymales, and descend by two 

 canaliculi to empty into the lachrymal sac. 



DUCTS' OF/ 



LACHRYMAL. 

 GLAND 



CARUNCLE 



CANALICULUS 



LACHRYMAL SAC 



NASAL DUCT 



FIG. 162. 

 The lachrymal apparatus. (Gerrish, after Testut.) (Eclcley.) 



The superior canal descends obliquely inward and down- 

 ward, while the inferior descends at first and then passes nearly 

 horizontally inward. 



THE LACHRYMAL SAC is the oval, dilated, upper portion of 

 the nasal duct, lodged in a deep groove formed by the nasal 

 process of the superior maxilla and the lachrymal bone. It is 

 crossed by the tensor tarsi muscle, which acts as a compressor, 

 and receives a fibrous expansion from the tendo oculi. 



Its structure is made up of a fibrous elastic coat, lined by 

 mucous membrane continuous with the nose and conjunctiva. 



THE NASAL DUCT is a membranous tube about three-quarters 

 of an inch in length, extending from the lachrymal sac to the 

 inferior meatus of the nose, and lining the bony lachrymo-nasal 



