88 DISSECTION OF THE EVE. 
through the conjunctiva along the line of the fornix 
conjunctive of the upper lid. The lachrymal gland 
will be exposed lying on the upper and outer surface 
of the eyeball, between it and the tendinous margin 
of the orbit. Its ducts open upon the eyeball along 
the fornix conjunctivee. 
NUSCLES OF THE EYEBALL: 
Remove the skin from the head. To expose the 
orbital cavity remove the zygomatic arch by sawing 
through wt at zts two ends and adrssecting rt off from 
the underlying parts. Next dissect away the muscu- 
lar mass lying beneath the zygoma and on the side of 
the skull, wn doing this zt will be necessary to cut 
through and remove the coronord process of the man- 
dible, using the bone forceps. The eyeball with tts cone- 
shaped mass of muscles running backward from tt wll 
now be exposed ; all other tessues, muscle, fat, etc., neust 
be dissected away as carefully as possible. 
Six eye-muscles are usually described, namely, 
the internal and external rectus, the superior and in- 
ferior rectus, and the superior and inferior oblique. 
The dog has in addition a representative of the large 
retractor bulbi lying beneath the six muscles men- 
tioned. No special directions can be given for dis- 
secting out these various muscles. The student should 
read over first the descriptions of all of them, and then 
dissect as neatly as possible. None of the muscles 
will be difficult to expose except the superior oblique, 
which is very hable to be injured or overlooked ; the 
upper and inner angle of the orbit, therefore, where its 
tendon is reflected to the eyeball must be dissected 
with particular care. 
