A text-book on diseases of the ear, nose and throat . r tendon of tensor tym-pani passing to the membrana; e, malleo-incudal joint; /, mastoid process, outersurface ; g, upper mastoid cells ; h, middlecranial fossa, outer back part; i, vestibule ;k, section through posterior semicircularcanal; I, aditus ad antrum; vi, mastoidcells; n, antrum. ^ Henle, Eingeweidelehre, S. 747. 2 Ludwig and Politzer, Meissners Jahresbericht, 1860, S. 583. Helmholtz. 40 DISEASES OF THE EAE. In the posterior wall of the tympanic cavity is situated the importantopening communicating with the mastoid antrum, and by
A text-book on diseases of the ear, nose and throat . r tendon of tensor tym-pani passing to the membrana; e, malleo-incudal joint; /, mastoid process, outersurface ; g, upper mastoid cells ; h, middlecranial fossa, outer back part; i, vestibule ;k, section through posterior semicircularcanal; I, aditus ad antrum; vi, mastoidcells; n, antrum. ^ Henle, Eingeweidelehre, S. 747. 2 Ludwig and Politzer, Meissners Jahresbericht, 1860, S. 583. Helmholtz. 40 DISEASES OF THE EAE. In the posterior wall of the tympanic cavity is situated the importantopening communicating with the mastoid antrum, and by that means withthe mastoid cells. The tympanic or mastoid antrum is a cavity of irregu-lar shape, the roof of which is a continuation backward of the tegmentympani (Fig. 34, h, and Fig. 36, n). It is formed by a hollowing out of thebase of the pyramidal part of the temporal bone, which is joined to themastoid portion at the upper part of the latter. This cavity may extendforward into the root of the zygomatic arch and downward into the mas- FiG. Fig. 38. AR. CRIB. SUP. Cast of the soft parts of the middle ear, viewed from without: the cartilaginous portion of theEustachian tuhe is not included. (Siebenmann.) 1, attic of the drum-cavity in front of the plicatransversa; 2, plica transversa; 3, posterior superior horizontal cells; 4, large solitary cell, includingnearly all the mastoid process ; 5, handle of the malleus ; 6, cells on the floor of the Eustachian tube;-7, large penniform cell of the inner wall of the Eustachian tube ; 8, isthmus of the Eustachian tube. toid cells. It communicates with the tympanum by means of a wide opening, the under edge of which is about on a level with the oval window. The floor of the tympanic cavity rises back-ward to meet this opening, in the same way asit rises anteriorly to the opening for the Eusta-chian tube (Fig. 37, 1-4). Course of the Facial Nerve.—Although thefacial canal has been already mentioned inconnection with the inner w
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