. Elements of histology. Histology. Ear. 463 propria. At one side (the one away from the bone) this tunica propria forms numerous papillary projec- tions. The internal surface of the membrane is covered with a single layer of polyhedral epithelial cells. 464. Each of the branches of the nervns vestibuli — one for the sac- cule, one for the utricle, and three for the three ampullae — possesses a ganglionic swelling. The nerve - branch, having passed through the mem- branous wall, enters special thickenings of the tunica propria, on that part of the mem- branous wall next to the bo
. Elements of histology. Histology. Ear. 463 propria. At one side (the one away from the bone) this tunica propria forms numerous papillary projec- tions. The internal surface of the membrane is covered with a single layer of polyhedral epithelial cells. 464. Each of the branches of the nervns vestibuli — one for the sac- cule, one for the utricle, and three for the three ampullae — possesses a ganglionic swelling. The nerve - branch, having passed through the mem- branous wall, enters special thickenings of the tunica propria, on that part of the mem- branous wall next to the bone : in the saccule and the utricle the thicken- ing is called macula acustica, in the ampullae crista acustica (Fig. - 7 7) (M. 8chultze). This thickenin*^ is a lar^je villous or fold-like pro- jection of the tunica })ropria, into which pass the nerve fibres of the several branches. These tibres are all meduUated nerve fibres, and, ascending towards the internal or free surface of that pro- jection, form a plexus. In this plexus are in- terspersed numerous nuclei. From the medullated fibres pass oS minute bundles or primitive fiVjrillse, which enter the epithelium that covers the free surface of the projection. 465. This epithelium is composejcl of a laver of. Fig. 277.—From a Transverse Section through the Macula acustica of the Utricle of the Labyrinth of Guiuea- pig. {Atlas.) a, Medullated nerve fibres, forming plex- uses ; b, nuclei of the membrane; c, sensory epithelium (diagrammatic); the spindle-shaped sensory cells possess long auditory hairs projecting between the conical epithelial cells beyond the free 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 Klein, E. (Edward), 1844-1925; Edkins, John Sydney, b. 1865. Philadelphia : Lea Brothers
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