. Cunningham's Text-book of anatomy. Anatomy. Cuticular wall Fibres of the ramus recessus utriculi Fig. 722.—Vertical Section of the Wall of the Recessus Utriculi with the Macula Acustica and the bundles of nerve fibres. (b) an intermediate, transparent tunica propria, presenting a number of papiiliform elevations which project towards the lumen. The fibrous layer and tunica propria are thinnest along the attached surface of the duct, and in this region also the papiiliform elevations are absent; (c) an internal epithelial layer, composed of pavement cells. In the ampullae the tunica propria i
. Cunningham's Text-book of anatomy. Anatomy. Cuticular wall Fibres of the ramus recessus utriculi Fig. 722.—Vertical Section of the Wall of the Recessus Utriculi with the Macula Acustica and the bundles of nerve fibres. (b) an intermediate, transparent tunica propria, presenting a number of papiiliform elevations which project towards the lumen. The fibrous layer and tunica propria are thinnest along the attached surface of the duct, and in this region also the papiiliform elevations are absent; (c) an internal epithelial layer, composed of pavement cells. In the ampullae the tunica propria is much thickened, and projects into the cavity as a transverse elevation, termed the septum transversum, which, when seen from above, is somewhat fiddle-shaped; its most prominent part is covered by acoustic epithelium forming the crista ampullaris, at each end of which is a half-moon-shaped border of small columnar cells, the planum semilunatum. The cells covering the crista ampullaris consist of supporting cells and hair cells, and are similar in their arrangement to those in the maculae of tbe utricle and saccule; the hairs of the hair cells are, however, considerably longer, and project as far as the middle of the ampullary lumen. In fresh specimens they appear to end free, but in hardened preparations are seen to terminate in a soft, clear, dome-like structure, the cupula terminalis, which is striated, the striae converging towards its concavity. The nerves form arborisations around the bases of the bair cells. Membrana vestibularis Membrana tectoria Stria vascularis. Sulcus spiralis internus Limbus lamina spiralis Ligameutum // spirale -Crista basilaris Inner hair cell , Outer hair cells Membrana basilaris SCALA TYMPANI Fig. 723.—Section across the Ductus Cochlearis (Retzius). Ductus Cochlearis.—The ductus cochlearis ( membranous cochlea or scala media) is closed at both of its extremities; the lower extremity occupies the recessus cochlearis of the vestibule an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
