. First book on anatomy, physiology, and hygiene : for grammar schools and families . the external from themiddle ear. It is called membra-na tympan-i, or drum ofthe ear. This and the bitter wax found around the hairs in thetube, prevent insects from entering the head. 466. The middle ear is connected with the internal and 462. What is said of the sense of hearing ? 463—476. Give the anatomyoft/ie organs ofhearing. 463. Name the parts of the ear. 464. Describe theexternal ear. What is said of the ears of horses, rabbits, &c. ? 465. De-scribe the drum of the ear. 466. How is the middle ear conn
. First book on anatomy, physiology, and hygiene : for grammar schools and families . the external from themiddle ear. It is called membra-na tympan-i, or drum ofthe ear. This and the bitter wax found around the hairs in thetube, prevent insects from entering the head. 466. The middle ear is connected with the internal and 462. What is said of the sense of hearing ? 463—476. Give the anatomyoft/ie organs ofhearing. 463. Name the parts of the ear. 464. Describe theexternal ear. What is said of the ears of horses, rabbits, &c. ? 465. De-scribe the drum of the ear. 466. How is the middle ear connected withthe internal cavity ? ANATOMY OF THE ORGANS OF HEARING. 153 most important cavity, by four small bones, which are the mosldelicate and beautifully shaped bones in the body. These areso arranged, as to form a chain from the drum of the ear tothe labyrinth. 467. From the middle ear, a tube opens into the back partof the throat, called En-stachi-an, which admits air into thispart of the ear. If this tube is closed by disease of the throat,hearing is impaired. Fig. Fig. 81. a, The external ear. c, The tube that leads to the middle ear. g, Thedrum of the ear. e, h, The middle ear. b, f, ft, The internal ear. i, The tube thatleads to the throat, d, The auditory nerve. 468. The internal ear is very intricate, and the uses ofits various parts are not well known. It is called the labyrinth,from its many windings. This part of the ear is composed ofa three-cornered cavity, called the vesti-bule, the cochle-a,(from its resembling a snail shell,) and thesem-i-circu-lar canals. 467. What tube opens into the middle ear ? What is its use ? Explainfig. 81. 468 Describe the internal ear. 154 ANATOMY, PHYSIOLOGY, AND HYGIENE. 469. The internal ear is the only part that is absolutelyessential in hearing. Other parts, already described, may beremoved, and yet the person may hear. Fig. 82.
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