. Animal biology; Human biology. Parts II & III of First course in biology. Biology. THE SENSES 155 middle ear pass on the vibrations of air to the ends of the fibers of the auditory nerve in the internal ear. The external ear consists of a large wrinkled cartilage on the exterior of the head and a canal leading from it, called the meatus. This passage is closed at its inner end by the drum membrane or drum skin. It is often called the drum, but this name is properly applied to the whole middle ear. A trial will show that the drum skin cannot The Hammer (Malleus). Moatus The Drum of the Ea
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. THE SENSES 155 middle ear pass on the vibrations of air to the ends of the fibers of the auditory nerve in the internal ear. The external ear consists of a large wrinkled cartilage on the exterior of the head and a canal leading from it, called the meatus. This passage is closed at its inner end by the drum membrane or drum skin. It is often called the drum, but this name is properly applied to the whole middle ear. A trial will show that the drum skin cannot The Hammer (Malleus). Moatus The Drum of the Ear (Tympanic Membrane}.. The. Loops (jStmirirctilar The Shell Tube [Cochlea). The Anvi] (Incus). The Stirrup (Stapes). Eustachian Tube FIG. 128. —MIDDLE AND INTERNAL EAR (greatly enlarged). be seer even with the aid of a bright light, for the passage is siifciiJy curved (see Fig. 128). Hence a missile or a flying insect cannot go straight against the ear drum. The skin lining this passage contains wax glands> which secrete a bitter sticky wax, which helps to keep the passage flex- ible. This wax catches dust and usually stops insects that may enter. If an insect enters the ear, it may often be by a bright light held close to the ear. The ear wax in a healthy ear dries with dust and scales of epi- dermis and falls out in flakes, thus cleansing the ear. It. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1910
