. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Fig. 176.—Head and Antbriok PoETioN or Body of a Chick. (In part after Moldenhauer.) RG, olfactory pit ; A, eye ; / to IV, first to foiirth visceral arches ; t, point at which the external auditory passage begins to be formed; LB, primitive auditory vesicle seen through the wall of the Fig. 177.—Semidiaorajoiatic Figdee of THE Membranous Labyeisth of Verte- brates. (Seen from the outer side.) u, utriculus ; rec, recessus utriculi; sp, sinus posterior utriculi; s, sacculus ; I, recessus sacculi (lagena) ; cus, ut
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Fig. 176.—Head and Antbriok PoETioN or Body of a Chick. (In part after Moldenhauer.) RG, olfactory pit ; A, eye ; / to IV, first to foiirth visceral arches ; t, point at which the external auditory passage begins to be formed; LB, primitive auditory vesicle seen through the wall of the Fig. 177.—Semidiaorajoiatic Figdee of THE Membranous Labyeisth of Verte- brates. (Seen from the outer side.) u, utriculus ; rec, recessus utriculi; sp, sinus posterior utriculi; s, sacculus ; I, recessus sacculi (lagena) ; cus, utriculo-saccular canal; de, se, ductus and sacous endolym- phaticus, the former arising from the sacculus at t ; ss, sinus utriculi superior; ass, apex oi the same ; ca, ce, cp, anterior, external, and posterior semicircular canals; aa, ae, aji, the corresponding ampullae. of the ectoderm on either side of the primary hind-brain : this be- comes separated off to form a vesicle (Fig. 176), and its epithelium is differentiated into elongated cells of sensory cpithelmm pro- vided with hair-like processes (Figs. 178 A and B) separated by su2}2}ortinff cells. The sensory cells are surrounded by a nerve- network, and are not continuous with the nerves as in the case of the olfactory cells (p. 197). Like the other higher sense-organs, the paired auditory organ. 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 Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
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