File:An academic physiology and hygiene (1903) (14778841914).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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mong theiai senses is that of sight. Through it are received the most varied and valuable impressions, and by it webecome cognizant of objects around US, and are enabled toappreciate the beauties of form and color in nature. De-prived of it we should lose SO much that is grand andLlltiful in life, that to behold a blind poison fills us withpity, while the thought of such an affliction tailing upon 316 ACADEMIC PHYSIOLOGY. ourselves appalls the bravest mind. Sight and touch arevery intimately related in some of their functions. 6. Anatomy of the Eye. — Securely lodged in the cavityor socket prepared for it in the front part of the cranium,is that organ, marvellous in structure, which enables us tosee. The eyeball is nearly spherical in form, and is pro-tected by the bony socket in which it is set, and by the cur-tains of cartilage and skin, the eyelids. To still furtherward off insects, and veil it from dust or particles thatmight invade it, the eyelashes close and interlock when the
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Fig. 53. EXPLANATION. a, the lachrymal, or tcar-gland, lyingbeneath the upper eyelid. b, b, the situation of the openingsthrough which the tears flow into thetubes that convey them into the nasalsac and duct. c, c, the tubes continued from the open-ings. d, the nasal sac e, the nasal duct, continued from thenasal sac. /, little canals that convey the tears tothe eye from the gland. lids are brought together, while the eyebrows surmount alland aid in preventing perspiration from running into theeyes. To lubricate its surface and prevent friction againstthe lids, there is a watery secretion from the tear-gland.The eye is supplied with nerves and blood-vessels, and itsfreedom of motion in various directions is due to the actionof muscles attached to its outer coat. 7. The muscles of the eye are represented in Fig. 54.The natural appearance of the eye and accurate sight de-pend largely upon the harmonious action of the muscleswhich move the eyeball. When one muscle contracts SIGHT. 317 un

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