File:An academic physiology and hygiene (1903) (14778845634).jpg

Identifier: academicphysio00bran (find matches)
Title: An academic physiology and hygiene ..
Year: 1903 (1900s)
Authors: Brands, Orestes M. (from old catalog) Van Gieson, Henry C., (from old catalog) joint author
Subjects: Hygiene Physiology
Publisher: Boston, B. H. Sanborn & co
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ft. The remaining two are called oblique muscles,and serve to roll the eye inward and downward. 1, the muscle which raises the upperInt. 2. the superior oblique muscle. j, the pulley through which its tendonplays. 4, 5, 6, straight muscles. 10, inferior oblique muscle. 11, the optic uer7>e (nerve of sight). 12, cut surface of cheek-bone, 13, opening of the nose or nasal ori- fice. condition is produced, in either instance causing strabis-mus, or cross-eye, 8. The eyeball is about an inch in diameter, and, thoughapparently spherical, is really a little elongated from be-fore backward. It is composed of three tunics, or coats, 3i8 ACADEMIC PHYSIOLOGY. enclosing three refracting mediums, all being so arrangedas to constitute a complex optical instrument. 9. Coats, Humors, Lens, etc., of the Eye. — The outer layerof the eyeball, the sclerotic coat (Gr. skleros, hard) whichforms the posterior five-sixths of the ball, is a white,hard, fibrous structure continued in front by the cornea,
Text Appearing After Image:
Fig. 55. 15 A - Diagram of Vertical Section of the Eye. EXPLANATION. A, The Sclerotic Coat. B, The Choroid Coat. C, The Retina. D, The Optic Nerve. E, The Cornea. F, The Aqueous Humor. G, The Iris. //, The Ciliary Processes.I, The Crystalline Lens.A, The Vitreous Humor. (Lat. comity horn) or transparent sixth, through whichlight passes to the interior of the globe. The part calledthe sclerotic coat maintains the shape of the eyeball, and,by its elasticity, controls the proper curvature of thecornea. It also affords attachment to the muscles thatmove the eye, and protects the more delicate parts within.The cornea forms the prominent curved surface of the SIGHT. 319 front of the eyeball, and is the window of the eye, beingas essential to sight as a window of a house is for theadmission of light. It is not supplied with blood-vessels,but receives its nutrition by diffusion from other parts. 10. The second layer is called the choroid coat (Gr.chorion, leather), and includes the iris (Lat.

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