File:A text-book of the diseases of the ear and adjacent organs (1894) (14801340343).jpg

Identifier: adjacendis00poli (find matches)
Title: A text-book of the diseases of the ear and adjacent organs
Year: 1894 (1890s)
Authors: Politzer, Adam, 1835-1920 Dodd, Oscar Dalby, William B. (William Bartlett), Sir, 1840-1918
Subjects: Ear Diseases
Publisher: Philadelphia : Lea Brothers & Co.
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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Text Appearing Before Image:
t the carotid canal. Itsrounded belly extends parallel to the Eustachian tube, is closely appliedpartly to the membranous portion (Fig. 45, I, h), which forms the base of thetube, partly to the cartilaginous plate, and is inserted in a radiating mannerinto the soft palate below the orifice of the tube in the pharynx. None of * Compare v. Troltsch, Arch. f. Ohrenheilk., vol. ii., and v. Moos, Archiv. f.Angen. und Ohrenheilk., vol. i. 44 MUSCLES OF EUSTACHIAN TUBE. its fibrous bundles arise, as was formerly believed, from the Eustachian tube,for it is only attached to it by a short band of connective tissue. The actionof the levator palati mollis is not confined to the velum palati alone, for thebase of the Eustachian tube is raised at every contraction of the muscle, bywhich the orifice of the tube is made smaller, but the resistance in the tubeis lessened owing to the shortening and widening of its aperture. The tens, palat. moll. (sphcno-sal+nngo-stajihijUnus %. circumflexus jpalat.)
Text Appearing After Image:
Fig 45.—Eustachian Tube with its Muscles (Natural Size).*, Cartilaginous plate of the Eustachian tube ; m Pars »*™? <*JJjEustachian tube ; os, Ostium pharyng. tubae ; ch, Choana ;J, Mnsc. legator palatimo lis ; T, Radiation of the levator in the velum palati ; h Hamu us pterygoideus ;I t, Muse, tensor palati mollis, winding round the hamulus. After a preparationin my collection. (Right side.) has its origin at the inferior surface of the sphenoid bone ; a great number ofits bundles, however, come from the short, hook-like part of the lateral carti-laginous wall (Fig. 45, f, t), and from the membranous part of the cartilaginousportion of the tube. In its downward course its flat belly lies close to thelateral wall of the membranous portion of the tube, and is rather firmly MUSCLES OF EUSTACHIAN TUBE. 45 attached to it. The direction of the fibres of the belly, the tendon of whichis coiled round the hamulus pterygoideus, and radiates in the fibrous pro-longation of the hard pala

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