438 



ANATOMY FOR NURSES 



[Chap. XX 



Accessory 

 Organs 



Nerves of 

 Eye 



Lacrimal 

 apparatus 



Tears 



Consist 

 of 



Lacrimal gland — in the upper and outer 



part of tlie orbit. Secretes tears. 

 Ducts — 7 to 12 lead from gland to con- 

 junctiva. 

 Canaliculi — 2 canals y to ^ in. long, begin 



at punctae and open into lacrimal sac. 

 Lacrimal sac — upper dilated portion of 



the nasal duct. 

 Xasal duct — canal f in. long, extends from 

 lacrimal sac to the nose. 



Secretion constant. 

 Moisten the eyeball and 

 help to moisten inspired 

 air. 



f Water. 

 { Salt. 

 I Albumin. 

 Carried off by nasal duct. 

 ' Superior rectus. 

 Inferior rectus. 

 Internal rectus. 

 External rectus. 

 Superior obUque. 

 , Inferior obUque. 



Determines the 

 position of the 

 I lens, 

 r Contractor of 



pupil. 

 I Dilator of pupil. 

 ■ 1. Optic nerve concerned with vision only. 

 Internal rectus muscle. 

 Superior rectus muscle. 

 Inferior rectus muscle. 

 Inferior obUque muscle. 



3. Pathetic controls the superior obUque muscle. 



4. Abducens controls the external rectus muscle, 

 l 5. Ophthalmic. 



Muscles 



Extrinsic 



Intrinsic 



Ciliary 

 muscle 



Muscles 

 of iris 



2. Motor 

 oculi 

 controls 



