A text-book of the diseases of the ear for students and practitioners . brium as far as a point belowits centre. This fold, standing away from the drum membranewith a free, concave margin, forms, with the posterior surface ofthe above-mentioned membrane, the posterior tympanic pouch(v. Troltsch)—recessus membraiue tympani posterior (Fig. 17,/); itsrelations are shown in the accompanying Fig. 18. The anteriorpouch, the smaller of the two, is formed by an osseous projectionfrom the neck, the ligamentous and osseous remains of the longprocess of the malleus, by the chorda tympani, the inferior ty
A text-book of the diseases of the ear for students and practitioners . brium as far as a point belowits centre. This fold, standing away from the drum membranewith a free, concave margin, forms, with the posterior surface ofthe above-mentioned membrane, the posterior tympanic pouch(v. Troltsch)—recessus membraiue tympani posterior (Fig. 17,/); itsrelations are shown in the accompanying Fig. 18. The anteriorpouch, the smaller of the two, is formed by an osseous projectionfrom the neck, the ligamentous and osseous remains of the longprocess of the malleus, by the chorda tympani, the inferior tym-panic artery, and the mucous membrane. The superior boundary MICROSCOPIC ANATOMY OF THE TYMPANIC MEMBRANE 17 of this pouch corresponds with the anterior gray stria of chorda tympani appears at the posterior superior marginof the sulcus tympanicus, communicates with the canalis facialis(Fallopii) by means of a small canal, and runs along the inferiormargin of the posterior tympanic pouch over the neck of thehammer to the Glaserian fissure (Fig. 11, f).. Via. 18.—Section through the Malleus and the Posterior TympanicPouch at the Level of the Short Process of the Malleus. h, Malleus ; br, Cartilaginous portion of its short process (Gruber); tr. Posteriorportion of the tympanic membrane ; fa, Posterior fold of the tympanic membrane ;ta, Posterior pouch of v. Troltsch ; s, Mucous lining of the tympanic cavity. The existence of an aperture at the anterior superior pole of the tympanicmembrane, described by Rivinus (1689) and Bochdalek (Prag. Viertetyahrschr.,1866), has never been fully proved. Schmiegelow ( 0., xxi.) could notfind a trace of a foramen of Rivinus in serial sections of the human drum. The Microscopic Anatomy of the Tympanic Membrane. The tympanic membrane is composed of three main layers, a middle fibrous(the lamina propria), an external cuticular (stratum cutaneum), and an internalmucous membrane layer (stratum mucosum). This was already known to
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