. Anatomy of the cat. Cats; Mammals. THE ORGAN OF SIGHT. 413 Through the cornea can be seen the yellow curtain-like iris, with an opening in its centre, the pupil. Coats of the Eye (Fig. 167).—The outer coat of the eye- ball is formed by the sclerotic (or sclera) {I?) and the cornea {c). The sclerotic is the whitish opaque portion covering the caudal three-fourths of the eye. It forms a tough sac serving as a protection for the structures within. The cornea {c) is the cir- cular transparent portion of the outer coat, covering the free surface of the eye; it is a direct continuation of the scle
. Anatomy of the cat. Cats; Mammals. THE ORGAN OF SIGHT. 413 Through the cornea can be seen the yellow curtain-like iris, with an opening in its centre, the pupil. Coats of the Eye (Fig. 167).—The outer coat of the eye- ball is formed by the sclerotic (or sclera) {I?) and the cornea {c). The sclerotic is the whitish opaque portion covering the caudal three-fourths of the eye. It forms a tough sac serving as a protection for the structures within. The cornea {c) is the cir- cular transparent portion of the outer coat, covering the free surface of the eye; it is a direct continuation of the sclerotic. Just before passing into the cornea the sclerotic is much thick- ened, forming a broad white zone (//) about the eyeball near its equator. To this zone, at its caudal margin, are attached the rectus muscles of the eyeball. The sclerotic has many pigment-cells on its inner surface, giving it a brownish appear- ance and forming the lamina fusca. The cornea (t) is transparent and more strongly cuived than the sclerotic. It is thicker than most of the sclerotic coat, but not so thick as the white zone of the latter. Within the sclerotic is the second coat of the eye, formed by the choroid {d) and the iris {e). The choroid {d) is a vascular layer, and contains much pigment, giving it a dark color. It lines the inner surface of the sclerotic, but does not cover the inner surface of the cornea. At the white zone of the ^'""^ JS* 7 ^'^'"''''^' ""^ ^ Section of the Eye. sclerotic it is thrown into a large num- a, optic nerve; d, sclerotic ber (about seventy) of meridional folds, (^'' thickened " white zone"); ^, ,. ... M- r 1 1 1-1 ^ cor'iea; </, choroid; e, iris; the plicae Clliares or ciliary folds, which /, ciliary body; g, retina; /i, together constitute the so-called ciliary ^7^*^"'"^ 'f"^; '• =L°""1^ '^'''; ° _ ^ •' aris; J, anterior chamber of body (corpus Ciliare) (/). This forms eye; /.-, vitreous hum
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Keywords: ., bookcentury1900, bookcollect, booksubjectcats, booksubjectmammals
