248 
(e) 
(f) 
ANATOMY OF THE RABBIT. 
The epiglottic cartilage (cartilago epiglottica) is a trian 
gular plate supporting the epiglottis. 
The rudimentary vocal folds (plicae vocales) may be seen as 
vertical folds of the internal surface of the larynx, especially 
prominent when the thyreoid cartilage is bent downward on 
tho cricoid. Each fold forms the posterior boundary of a 
shallow pouch, the laryngeal ventricle (veniriculus 
laryngis). 
In addition to the criothryreoidei, the laryngeal cartilages are 
connected by several small muscles, including the cricoarytenoidei 
posterior and lateralis, the thryreoarytenoideus and the arytenoideus 
transversus, the last named being an unpaired muscle connecting the 
arytenoid cartilages. 
The eye and related structures of the orbital cavity. 
The eyeball should be carefully separated from the bony orbital 
rim. 
The first portion of the nasolacrimal duct (d. nasolacrimalis), 
passing from its aperture on the medial surface of the lower eyelid 
to the lacrimal bone, will be divided. The muscles and glands of the 
orbit may be made out as follows: 
(a) 
(b) 
(c) 
(d) 
(e) 
The levator palpebrae superioris. Origin: Wall of 
the orbit above the optic foramen. Insertion: Upper 
eyelid. 
This thin sheet of muscle should be separated from the underlying 
rectus superior of the eyeball. 
The obliquus superior. Origin: Anterior margin of the 
optic foramen. The muscle passes upward on the wall of the 
orbit, then beneath a fibrous cord, the trochlea, which bridges 
a small portion of the orbital wall and changes the course of 
the tendon by a considerable angle. Insertion: Antero- 
dorsal portion of the eyeball. 
The obliquus inferior. Origin: Lacrimal bone.  In- 
sertion: Posteroventral portion of the eyeball. 
The four recti muscles, superior, inferior, medialis, 
and literalis, arise from the boundary of the optic foramen, 
and are inserted respectively on the dorsal, ventral, anterior, 
and posterior portions of the periphery of the eyeball. 
The retractor oculi (best seen after the removal of the eye) 
arises in common with the foregoing recti muscles, and is 
