. Elements of comparative zoology. Zoology. Fig tebrates 111.âRelations of the olfactory organ. A b, bn surface is folded b, brain; i, internal nostril; n !f in fishes; B, in higher ver- external nostril. The sensory fish can perceive odors in the water only as it swirls in and out of the nasal sac. In the air-breathing forms, odors in the air are drawn with the breath over the sensory surface. The essential part of the ear, the inner ear (fig. 112), con- sists of a thin membranous sac on either side of the head. s In three places this sac is so pinched as to form small tubes (semicircular can
. Elements of comparative zoology. Zoology. Fig tebrates 111.âRelations of the olfactory organ. A b, bn surface is folded b, brain; i, internal nostril; n !f in fishes; B, in higher ver- external nostril. The sensory fish can perceive odors in the water only as it swirls in and out of the nasal sac. In the air-breathing forms, odors in the air are drawn with the breath over the sensory surface. The essential part of the ear, the inner ear (fig. 112), con- sists of a thin membranous sac on either side of the head. s In three places this sac is so pinched as to form small tubes (semicircular canals) open at either end into the main chamber. The whole is filled with fluid in which are nu- merous minute solid par- ticles (otoliths). At one Fig. 112.âDiagram of mammalian ear. c, i r "u j. "U â J « + cochlea; e, Eustachian tube; s, semicir-end 01 each tube and at cular canals, connected with the central -. * +Vi âro sac and separated from the surrounding places in tUe Sac are bone (black) by a space; t, tympanic , â , cavity closed externally by membrane, and SenSOiy Organs Connected traversed by a bone, which conveys the .,, ,, -,., sound-waves to the inner parts. With the auditory nerve. Sound-waves entering the ear set the fluid in motion, causing the otoliths to strike the sensory organs and thus to stimulate 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
Size: 1925px × 1298px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
