. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. THE NERVOUS SYSTEM. 179 many Insects it is on the wing. Lobsters and Crabs have the auditory sacs at the base of the Fig. 151.—Brain and Auditory Apparatus of the Cuttle-fish: a, b, brain; c, auditory apparatus; d, the cavity in which it is lodged; e,f, g, eyes; 1,2, 3, otoliths. A complex organ of hearing, located in the head, exists in all Vertebrates, save the very lowest Fishes. As com- plete in Man, it consists of the following parts: 1st
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. THE NERVOUS SYSTEM. 179 many Insects it is on the wing. Lobsters and Crabs have the auditory sacs at the base of the Fig. 151.—Brain and Auditory Apparatus of the Cuttle-fish: a, b, brain; c, auditory apparatus; d, the cavity in which it is lodged; e,f, g, eyes; 1,2, 3, otoliths. A complex organ of hearing, located in the head, exists in all Vertebrates, save the very lowest Fishes. As com- plete in Man, it consists of the following parts: 1st. The external ear (which is peculiar to Mammals); the auditory canal, about an inch long, lined with hairs and a waxy se- cretion, and closed at the bottom by a membrane, called tympanum, or "drum of the ; 2d. The middle ear, contain- ing three little bones (the smallest in the body), mal- leus, incus, and stapes, ar- ticulated together. The Cavity Communicates With —Section of Human Ear: a, external , 1 * u ear' w^th andit°ry canal; 6, tympanic cavi- tlie external air by means ty containing the three bones; c, hammer, nf thp "FWflphisn tnhp and its three muscles' d> +fi 9> tympanic ui Lilt; JLUtotdOllldll lUUU, membrane, or head of the drum; h, Eusta- Wllich ODenS at the back chian tube leading to the pharynx ; i,laby- 1 rinth, with semicircular canals and cochlea part of the mouth. 3d. visible. The internal ear, or labyrinth, an irregular cavity in the solid part of the temporal bone, and separated from the. 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 Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
