. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 226 ELEMENTS OF BIOLOGY The Eye of Vertebrates. The essential features of the verte- brate eye are: A spherical cup at the base of which are the nerve ciuAnr MuscLS AQUEOUS HUMO/f supcmon rectus muscle VITREOUS HUMOR SCLERA IRIS PUPIL LENS CORNEA. SUSPENSORr LIGAMENT OPTIC NERVE HYALOID CANAL INFERIOR RECTUS MUSCLE SUPERIOR OBLIQUE SUPERIOR RECTUS INTERIOR PECTUS . Fig. 154.—Diagram of a longitudinal section through the human eye. endings and the receptors with the light-sensitive substances
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 226 ELEMENTS OF BIOLOGY The Eye of Vertebrates. The essential features of the verte- brate eye are: A spherical cup at the base of which are the nerve ciuAnr MuscLS AQUEOUS HUMO/f supcmon rectus muscle VITREOUS HUMOR SCLERA IRIS PUPIL LENS CORNEA. SUSPENSORr LIGAMENT OPTIC NERVE HYALOID CANAL INFERIOR RECTUS MUSCLE SUPERIOR OBLIQUE SUPERIOR RECTUS INTERIOR PECTUS . Fig. 154.—Diagram of a longitudinal section through the human eye. endings and the receptors with the light-sensitive substances that, when affected by light, activate the nerves; a lens suspended in front of the nerve endings in such a way as to converge the rays of light and to form an image on the sensitive area of retina. As the source of light is moved far- ther away or nearer to the eye, the lens is accommodated to the changing distance. In the eye of the fish this is accomplished by means of a mechanism that moves the lens forward or backward, as one focuses the lens of a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buchanan, James William, 1888-. New York, London, Harper & brothers
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