A text-book of the diseases of the ear and adjacent organs . lla of the sagittal semicircularcanal (s) lies on the floor of the vestibule in the region of the openings of thehorizontal (h) and the combined openings of the frontal and sagittal semi-circular canals (co). The ampullar openings are separated from the vestibular 586 THE OSSEOUS LABYRINTH. ah as walls by projecting ridges—the crista ampullar. On the lower vestibular wall,below the fenestra ovalis, is the beginning of the lamina spiralis ossea membranacea (Fig. 293, s^) extend-ing towards the entrance of the scalavestibuli, and with
A text-book of the diseases of the ear and adjacent organs . lla of the sagittal semicircularcanal (s) lies on the floor of the vestibule in the region of the openings of thehorizontal (h) and the combined openings of the frontal and sagittal semi-circular canals (co). The ampullar openings are separated from the vestibular 586 THE OSSEOUS LABYRINTH. ah as walls by projecting ridges—the crista ampullar. On the lower vestibular wall,below the fenestra ovalis, is the beginning of the lamina spiralis ossea membranacea (Fig. 293, s^) extend-ing towards the entrance of the scalavestibuli, and with a slight bend fromwithin outwards. On the maceratedtemporal bone an opening is left bythe destruction of the beginning ofthe membranous spiral plate, throughwhich the vestibule communicateswith the lower part of the the anterior inferior wall is placedthe entrance of the cochlea mto thescala vestibuli. On the crista vestibuli as well ason the floor of the two recesses aresituated the so-called maculae crib-rosae, each with a number of foramina. Fig. 293.—Frontal Section through theVestibule : View of the PosteriorVestibular Wall. (Enlarged todouble its natural size.)o, Fenestra ovalis; a h, Ampulla horizontalis;as, Ampulla superior. ; s, Ampullaryorifice of the posterior semicircular canal;h, Embouchure of the horizontal semi- intended for the passage of the fibrescircular canal; co, Common embouchure of the vestibular nerve. The maculaof the frontal and sagittal canals ; sp, , ^ , - ., Commencing portion of the lam. spiralis cribrosa superior is destined for thein the vestibule ; st, Scala tymp. of the passage of the nerves of the utriclecochlea; hs, Hiatus subarcuatus. After and of the anWQge of the anteriora preparation in my collection. ,. , ,, , , n r J vertical and the horizontal semi- circular canals, the macula cribrosa media for the nerves of the saccule, and
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
