. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. 92 ANATOMY OF THE RABBIT Vibrations of the ear drum are transferred to a chain of ossicles in the middle ear (Figs. 47 and 90) the innermost of which fits loosely into an opening in the wall of the bony labyrinth and thus passes on the vibrations as pressure changes to the perilymph, which in turn transmits them to the organ of The Eye The eye is the special organ for the reception of stimulation by light and consists of a specialized portion of the brain, the reti
. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. 92 ANATOMY OF THE RABBIT Vibrations of the ear drum are transferred to a chain of ossicles in the middle ear (Figs. 47 and 90) the innermost of which fits loosely into an opening in the wall of the bony labyrinth and thus passes on the vibrations as pressure changes to the perilymph, which in turn transmits them to the organ of The Eye The eye is the special organ for the reception of stimulation by light and consists of a specialized portion of the brain, the retina, which has grown out on the end of a stalk of nervous tissue to come close to the surface and has been provided with a mechanism for focussing light rays upon it, the whole being enclosed in a support- ing and protective capsule. The capsule is nearly spherical and is composed of exceedingly dense connective tissue which forms an opaque white coat, the sclera, except over the exposed outer surface of the eye. On the exposed surface of the eye, the sclera is suddenly replaced by a transparent sheet of modified connective tissue which is fused with a thin outer layer corresponding with the epithelium of the con- j unctiva (the lining layer on the inner surface of the eyelids). This outer layer of the eye is also perfectly transparent and along with the transparent connective tissue constitutes the cornea, a highly refractive curved window. Internally, separated from the cornea by chambers con- taining a fluid, the aqueous humour, is suspended the lens, which is biconvex, somewhat more curved on its inner than on its outer surface, and composed of modified epithelium. This is suspended in a very thin capsule by a ring of fibres, the zonula ciliaris, which fibres are attached at their outer ends to a circular ridge of muscle, the ciliary body. The zonular fibres are under tension when the muscle is at rest, keeping the lens slightly flattened, and when the Fig. 48. Diagram of th
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