A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools (1889) (14576592740)

Identifier: healthybodytextb00stow (find matches)

Title: A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools

Year: 1889 (1880s)

Authors: Stowell, Charles H(enry) 1850- (from old catalog)

Subjects: Human physiology

Publisher: Chicago, J.C. Buckbee and company

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

Text Appearing Before Image:

tuated in the skin, the mouth, the throat, and at theentrance of the nose. The Sense of Weight. This is also called the muscularsense. By it we are enabled to judge the weight ofbodies. By long practice persons are able to detectvery slight differences between bodies even so light ascoins. The Sense of Hearing. The organs of hearing areamong the most difficult parts of the body to under-stand. We see only the outer ear, but the anatomistspeaks of two others, — the middle and the inner ears. The Outer Ear. The outer ear is the peculiarly sliapedpiece of cartilage on the side of the head by means ofwhich we catch sound-waves. This is very easily seen THE SENSE OF HEARING. 195 to be true of the lower animals: they always turn theirears in the direction from which the sounds come. Evenman is governed by the same principle, and when hishearing is not acute he will place his hand behind hisear and push it forward, at the same time making itlarger by adding to it the width of his hand. The

Text Appearing After Image:

Fig. 68. The ear : c, the auditory canal, that leads to the middle ear; M, themiddle ear, or drum. The drum-head is the curved white line to the left ofthe letter M; I, the inner ear; n, the nerve of hearing, going to the brain;T, the tube leading from the middle ear to the upper part of the pharynx. auditory canal, which is a part of the outer ear, and leadsto the middle ear, is about an inch in length. The Middle Ear. At the inner end of this canal is thedrum-head, while on the inner side of this membrane isthe drum, or middle ear. The drum-head completely shuts off communicationbetween the outer and middle ears. When sound-waves 196 A HEALTHY BODY. strike the drum-head, they cause it to vibrate, — muchas the head of an ordinary drum vibrates when struck. The middle ear, which is filled with air, is connectedwith the throat by means of a canal called the Eustachiantube. Through this tube air is admitted into the drum. The Inner Ear. The inner ear contains tlie ends of thenerve of

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1889

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