. Diseases of children. ept in a dark room. The nurse should always wash her hands in an anti-septic solution after treating ophthalmia, else she may infect her own eyes. THE EAR Anatomy.—The ear is divided into three divisions: theexternal or pinna, the middle ear, and the internal ear. The external ear or pinna is composed of cartilage,which is so arranged that it collects the air waves, and theauditory canal, which is about one inch long. At the internal end of the external auditory canal is thedrum, or tympanic membrane, a small membrane abouta half inch in diameter. 254 DISEASES OF CHILDR
. Diseases of children. ept in a dark room. The nurse should always wash her hands in an anti-septic solution after treating ophthalmia, else she may infect her own eyes. THE EAR Anatomy.—The ear is divided into three divisions: theexternal or pinna, the middle ear, and the internal ear. The external ear or pinna is composed of cartilage,which is so arranged that it collects the air waves, and theauditory canal, which is about one inch long. At the internal end of the external auditory canal is thedrum, or tympanic membrane, a small membrane abouta half inch in diameter. 254 DISEASES OF CHILDREN FOR NURSES The middle ear contains three bones: the malleolus^ theincus^ and the stapes. The malleolus is attached to thedrum and articulates with the incus, which in turn articu-lates with the stapes. They are so arranged as to form asystem of communication between the drum and theinner ear, by means of which the vibrations of the drumare transmitted to the inner ear. Roo/yBoni/ ffead ^Afcdkus ScnUcircular Cetnals. Facial T^irtK EustachUlan. Tudslaid open Fig. 72.—Frontal section of the organ of hearing (modified from Politzer). The Eustachian tube connects the middle ear with thepharynx. It is through this duct that inflammationextends from the pharynx and causes middle-ear disease{otitis media). The internal ear contains the organ of hearing calledthe cochlea. It is so arranged that the vibrations of thedrum are transmitted to the terminal filaments of theauditory nerve. The semicircular canals maintain the equilibrium of the DISEASES OF EYE, EAR, SKIN, AND GLANDS 255 body. Any disease or injury to them causes intensedizziness. The mastoid cells are in the mastoid process of thetemporal bone. They connect with the middle ear. Definitions.—Impacted Cerumen.—The term given tolarge quantities of wax in the external auditory canal. Furuncle ojCanal.—A small abscess of the auditory canal. Puncture oj Drum.—A rupture of the drum or tympanicmembrane. Otitis Media.—
Size: 1728px × 1446px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookiddisea, booksubjectchildren
