250 
(b) 
(c) 
(d) 
(e) 
(f) 
ANATOMY OF THE RABBIT. 
white investment of fibrous connective tissue enclosing the 
greater part of the eyeball, and a smaller transparent lateral 
portion, the cornea, covering the exposed surface. 
The vascular tunic (tunica vasculosa oculi), the thin middle 
coat of the eye; pigmented, except in albino animals. It is 
divisible into: (1) a general portion, the chorioidea, lying on 
the inner surface of the sclera; (2) a muscular portion, the 
ciliary body (corpus ciliare), forming an annular ridge about 
the periphery of the lens; and (3) the iris, the latter forming 
a circular fold suspended about the periphery of the lens and 
on its outer surface. 
The retina, the innermost layer of the eye, forms a thin soft 
membrane covering the inner surface of the chorioidea. It 
is divisible in a larger optic portion, the sensory part of the 
eye, and a smaller ciliary portion, lying about the periphery 
of the lens and distinguishable by the radiate markings of 
its surface, the latter formed by the projecting ridges of the 
ciliary body. 
The transparent lens of the eye is suspended by fine fila- 
ments, the zonular fibres, reflected from the margin of the 
ciliary body. 
The vitreous body (corpus vitreum), a transparent mass, of 
gelatinous consistence, occupies the large space enclosed by 
the lens and the retina. 
The space enclosed between the surface of the lens and the 
cornea is divisible into a larger portion, the anterior 
chamber (camera oculi anterior), lying outside of the iris, 
and a smaller portion, the posterior chamber (camera 
oculi posterior), lying between the iris and the lens. The 
central space enclosed by the free margin of the iris is the 
pupil (pupilla). 
12. Following the removal of the eye, the bloodvessels and 
nerves of the orbit may be freed from the remaining portions of the 
eye muscles and examined. In order to see their connections in the 
anterior angle of the orbit, it is necessary to break away the anterior 
root of the zygomatic arch, and also the bony ridge which lodges the 
alveoli of the posterior cheek-teeth. 
