Human Physiology; a Textbook for High Schools And Colleges
The book Human Physiology; a Textbook for High Schools And Colleges was written by author Percy Goldthwait Stiles Here you can read free online of Human Physiology; a Textbook for High Schools And Colleges book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Human Physiology; a Textbook for High Schools And Colleges a good or bad book?
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34.- -The right eyeball with some of its muscles in the shelter of the orbit. eyebrow secrete the tears into the sac behind the upper lid. The liquid spreads downward and inward over the surface of the eye to reach two little openings near the inner angle of the lids whence a duct provides for drain- age into the nose. The tears serve to wash the eye and preserve it from drying effects. The response of the glands when a foreign body has struck the cornea is reasonable, but that in emotional cri...ses is hard to ac- count for. The eyeball is described as composed of three coats. The outer one is tough and dense; the cornea is a part of it. The middle coat is distinguished by the rich- THE EYE 151 ness of its blood-supply; it seems to be specially con- cerned with nutrition. The innermost coat, reminding one of the plate or film in the camera, is the retina. It consists in part of nerve fibers which run from every region of it to the point of departure of the optic nerve. This nerve, in leaving the eye, necessarily perforates the middle and the outer coats.
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