Anatomy and physiology : designed for academies and families . thers, and amidst the odorous par-ticles emanating from a thousand sources. SENSE OF VISION. The visual apparatus consists of the second pair, or opticnerves, the eyeballs and their appendages. The optic nerve arises by two roots, one from the ihalamioptici, and the other from the corpora quadrigemina. Thetwo nerves approach each other, as they proceed forward, anda portion of the fibres of each, cross to the nerve of the oppo-site side. They then diverge and enter the globe of the righteye, through the posterior part of the sclero
Anatomy and physiology : designed for academies and families . thers, and amidst the odorous par-ticles emanating from a thousand sources. SENSE OF VISION. The visual apparatus consists of the second pair, or opticnerves, the eyeballs and their appendages. The optic nerve arises by two roots, one from the ihalamioptici, and the other from the corpora quadrigemina. Thetwo nerves approach each other, as they proceed forward, anda portion of the fibres of each, cross to the nerve of the oppo-site side. They then diverge and enter the globe of the righteye, through the posterior part of the sclerotic and choroidcoats, and then expand, and form a soft, whitish membrane,called retina. How does the mind become sensible of odoriferous particles ? On whatdoes the acuteness of smell depend ? Why does snuff render the sense of6mell obtuse ? Can the sense of smell be improved by education ? Whatis said of the acuteness of smell in the bloodhound ? Of what does theVisual apparatus consist ? Describe the course of the optic nerve. SENSE OF 188. 271. Fig. 188. Represents the second pair or optic nerves, with the origin of seven other fiairs. 1, 1, The globe of the eve. The one on the left hand is perfect, but that onhe right has the sclerotic coats removed to show the retina. 2, The crossing of theoptic nerves. 3, The corpora albk-antia. 4, The inftindibulum. 5, The pons , The medulla oblongata. 7, The third pair of nerves. 8, The fourth pair. 9 Thofifth pair. 10, The sixth pair. 11, The seventh pair. 12, The eighth pair. 13, Thoninth pair. The form of the eye-ball is that of a sphere, of about oneinch in diameter. It has the segment of a smaller sphere in-grafted upon its anterior surface, which increases its antero-posterior diameter. The axes of the eye-balls are parallel toeach other, but do not correspond to the axes of the orbits,which are directed outward. The optic nerves follow the di-rection of the orbits, and therefore enter the eye-balls at theirna
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
