. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 184 COMPARATIVE MORPHOLOGY OF VERTEBRATES. and a lower sacculus (fig. 183), the two connected by a narrow sac- culo-utricular canal. The sensory area becomes divided between the two, but the endolymph duct is connected with the sacculus alone. The anterior, posterior and lateral walls of the utriculus now produce flattened outgrowths, the lateral in the horizontal, the others in vertical planes, and parts of the sensory areas extend into each. Next, the walls of these diverticula become pinched together so that
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 184 COMPARATIVE MORPHOLOGY OF VERTEBRATES. and a lower sacculus (fig. 183), the two connected by a narrow sac- culo-utricular canal. The sensory area becomes divided between the two, but the endolymph duct is connected with the sacculus alone. The anterior, posterior and lateral walls of the utriculus now produce flattened outgrowths, the lateral in the horizontal, the others in vertical planes, and parts of the sensory areas extend into each. Next, the walls of these diverticula become pinched together so that each pocket se. FIG. 184.—Diagram of the membranous labyrinth of a vertebrate, the sensory areas dotted, ac, anterior semicircular canal; ap, ampullae; ca, cristse acusticae in the ampullae; de, ductus endolymphaticus; he, horizontal (external) canal; /, lagena; ml, mn, ms, mu, maculae of lagena (neglecta, sacculi and utriculi); pc, posterior semicircular canal; s, sacculus; se, saccus endolymphaticus; sue, sacculo-utricuar canal; u, utriculus. is converted into a tube or canal, open at either end into the utriculus, and hence approximately semicircular in outline. In one end of each of these semicircular canals there is a patch of sensory epithelium and the wall expands around this into an ampulla, the ampullae of the anterior and external canals being side by side, that of the posterior canal at its lower end. In the lower ichthyopsida there is little differentiation in the sac- culus, but in the higher a pocket, the lagena, is given off from its poster- ior side, a portion of the sensory epithelium extending into it. With in-. 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. Philadelphia, P. Blakiston's son & co.
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