A text-book of the diseases of the ear and adjacent organs . r Their form I _ _ . with the three ampullary dilatations at the origin andthe two openings, corresponds exactly with that of the osseous semicircularcanals. By means of the latter the cavity of the ampulla is divided into twounequal parts, of which the shorter, towards the utriculus. is known as thesinus portion, the longer as the tubal portion. Besides the flat and cylindricalepithelium of the ampulla, it has on the epithelial ridge of the crista () high cylindrical cells and a neuro-epithelium analogous to thaton the m
A text-book of the diseases of the ear and adjacent organs . r Their form I _ _ . with the three ampullary dilatations at the origin andthe two openings, corresponds exactly with that of the osseous semicircularcanals. By means of the latter the cavity of the ampulla is divided into twounequal parts, of which the shorter, towards the utriculus. is known as thesinus portion, the longer as the tubal portion. Besides the flat and cylindricalepithelium of the ampulla, it has on the epithelial ridge of the crista () high cylindrical cells and a neuro-epithelium analogous to thaton the macula acustica of the saccule. The membranous semicircular canals, the diameter of which is only one-third of the osseous canals, do not float, as was formerly thought, in the spacesof the osseous canals filled with perilymph, but u - _ 303) fastened by a - fe / Fig. 302. — MembranousLabyrinth. a, Utriculus : b, Superiorsemicircular canal : c,Eta ampulla : d, Pos-terior semicircular canal;C, Its ampulla ; /. Hori-zontal semicircular canal;g, Its Fig. 303.—View of the Topographical Position ofthe Membranous Semicircular Canals within theOsseous: TuAMsrmtam >i:t::n through the Pos-terior Part of the be Pyramid of aNewborn Infant. (Right Ear.) S, Transverse section of the superior semicircular canal:h h, Transverse sections of the horizontal semicir-cular canal ; p p. Transverse sections of the posteriorsemicircular canal : o, Fossa subarcuata ; an, Innerwall of the mastoid antrum. Afcer a preparation inmy collection. part of their wall to the osseous canal, consequently stationary (Kolliker,Rudinger). From the free part of the membranous canal (Fig. 3041 numerousvascular connective-tissue ligaments (d) proceed to the periosteum of theosseous canal. On the inner surface of the semicircular canals arisenumerous papillary elevations c) covered with epithelium, which are wantingon the adherent parts of the canal (&> and at the opening of the canalslRudingeri. They
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
