File:The essentials of health. A text-book of anatomy, physiology, hygiene, alcohol, and narcotics (1892) (14779540115).jpg

Identifier: essentialsofhea00stow (find matches)
Title: The essentials of health. A text-book of anatomy, physiology, hygiene, alcohol, and narcotics
Year: 1892 (1890s)
Authors: Stowell, Charles H(enry), 1850- (from old catalog)
Subjects: Physiology
Publisher: New York, Boston (etc.) Silver, Burdett & company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ohol ever come in directcontact with the brain ? 24. How does alcohol affect the brain? 25. How does it affect the will power? 26. What do the statistics of insane asylums show? 296 THE ESSENTIALS OF HEALTH. CHAPTER XXIX. THE SENSE OF SIGHT. Protection for the Eyes. The eyes are well protectedin deep sockets of bone, called the orbits. Externallythey are protected by the eyebrows, the eyelids withtheir glands, and the lachrymal glands. The noseis also a valuable protection to the eyes. The eyebrows pro-ject over the eyes andare covered with athick growth of hair.The hair is directedobliquely outwards, sothat the perspirationfrom the forehead iscarried to the side ofthe face, instead ofrunning directly downinto the eyes. The eyelids are thincurtains placed direct-ly in front of the eye-balls. In the centerof each eyelid is a thinplate of cartilage, on the outside of which is a thinmuscle covered with skin. The inside of the lids islined with a delicate membrane, called the conjunctiva.
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Fig. 100. The muscles of the righteyeball. The outer bony walls of the or-bit have been removed. (1) the musclewhich turns the eyeball upward ; (2)downward ; (3) outward ; a correspond-ing muscle on the inner side moves theeyeball inward; (4, 5,) muscle whichrotate the eyeball; (6) a pulley, throughwhich the tendon of the muscle (5) moves. THE SENSE OF SIGHT. 207 The Oil Glands. Oil On the edges of the lids is a row of delicate hairs, calledeyelashes. They protect the eyes from insects and par-ticles of foreign matter; for the moment any foreign bodies come in contact with the lashes the lids close,thus preventing the objects from touching the eyeball.The eyelids keep the heat and cold from the more deli-cate parts of the eye, and they also keep out an excessof light. Their most important function is to cleansethe eyes and to keep them moist. Their rapid and fre-quent movements thoroughly remove any particles ofdust from the front of the eyeball, while at the sametime they moisten the

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