112 



VETEBINAEY OPHTHALMOLOGY. 



good. Local bleeding and blisters, the bleeding being, 

 accomplished by shaving the part desired and apply- 

 ing leeches. ^ 



A word or two anent the Vitreous humor. It oc- 

 cupies all that portion of the eye behind the lens. Ha& 

 a depression in front called the lenticular fossa or fossa 

 patellaris in which rests the crystalline lens. It (th& 

 vitTeous) is adherent to the optic nerve and ciliary body 

 and has no other attachments. It is contained in the- 

 hyaloid membrane, and this membrane forms the zonule 

 of Zinn, and it is between the layers of the zonule and 

 around the circumference of the lens that we have the 

 canal of Petit. Now through the center of the vitreous, 

 may be discovered a canal, the canal of Cloquet, for the- 

 hyaloid artery duringfoetallife. This is sometimes (very 

 rarely) seen after birth, and is then termed Persistent- 

 Hyaloid Artery, and it has no attendant vein. The 



vitreous humor 

 has neither blood 

 vessels nor ner- 

 ves, but it must 

 be classed with 

 organized struc- 

 tures because of 

 the cells it always 

 contains. These 

 cells have no de- 

 ^'^- ^^- finite form, being- 



round, star, spindle, etc. 



