. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. A \S B Fig. 689. Outlines of two ears a, monkey, Macacus; b, a human pinna, showing "Dar- win's point," which is an infolding that resembles the projection on the pinna of the monkey's ear. (After Schwalbe.). Fig. 690. Embryonic stages in the de- velopment of the pinna. 1, tragus; 2, 3, helix; J,., 5, antihelix; 6, antitragus; 1, 2, 8, elevations of mandibular arch: If., 5, 6, elevations of hyoid arch; , auricular fold; otic vesicle. (A
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. A \S B Fig. 689. Outlines of two ears a, monkey, Macacus; b, a human pinna, showing "Dar- win's point," which is an infolding that resembles the projection on the pinna of the monkey's ear. (After Schwalbe.). Fig. 690. Embryonic stages in the de- velopment of the pinna. 1, tragus; 2, 3, helix; J,., 5, antihelix; 6, antitragus; 1, 2, 8, elevations of mandibular arch: If., 5, 6, elevations of hyoid arch; , auricular fold; otic vesicle. (After Arey.) The pinna develops on either side of the spiracular cleft which becomes the locus of the auditory canal. It arises originally as six knoblike elevations, three of which are borne by the mandibular, and three by the hyoid arch (Fig. 690). Pinnae become degenerate in aquatic and burrowing animals, such as seals, gophers, and moles, where they would serve no good purpose and might even be a disadvantage, but they are large in animals like bats that. 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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