A text-book of the diseases of the ear for students and practitioners . anner. The termination is usuallyfatal from metastases in the brain. * Macewen, Luc, Knapp, Politzer, Indications for opening up the MastoidProcess in Chronic Suppurative Inflammation of the Middle Ear (London:Sixth International Otological Congress, 1899). ANATOMY IN REFERENCE TO RADICAL OPERATION 539 Operative Methods for opening up the Accessory Cavitiesof the Middle Ear. [7 Anatomical Remarks.—Before proceeding with a descriptionof the operation for opening up the accessory cavities of themrddle ear, it might be of val
A text-book of the diseases of the ear for students and practitioners . anner. The termination is usuallyfatal from metastases in the brain. * Macewen, Luc, Knapp, Politzer, Indications for opening up the MastoidProcess in Chronic Suppurative Inflammation of the Middle Ear (London:Sixth International Otological Congress, 1899). ANATOMY IN REFERENCE TO RADICAL OPERATION 539 Operative Methods for opening up the Accessory Cavitiesof the Middle Ear. [7 Anatomical Remarks.—Before proceeding with a descriptionof the operation for opening up the accessory cavities of themrddle ear, it might be of value, in order to have a better idea ofthe operative procedure, to point out a few details regarding theanatomical relation of the antrum to the auditory meatus, andto consider the topographical relation of the descending partof the facial canal. The author has already mentioned theimportance of studying these conditions in sagittal, frontal andhorizontal sections, as it is only by such means that an idea isobtained of the variable size and situation of the antrum in. Fig. 261.—Frontal Section through the Eight Temporal Bone. g, Superior wall of the meatus ; u, Inferior wall of the meatus ; p, Mastoid process;c, Posterior wall of the tympanic cavity ; c, Inferior wall of the tympanic cavity ;an, Antrum ; /, Section of the facial canal on the inner wall of the tympaniccavity ; st, Place of exit of the opened descending part of the facial canal (stylo-mastoid foramen) ; at, Margo tympanicus of the external attic wall; 0, The partof the inner division of the superior wall of the meatus which must be chiselledaway when exposing the attic ; a, Compact part of the posterior wall of the meatus ;i, Internal auditory meatus ; v, Vestibule. pneumatic and diploetic mastoid processes; in the former theantrum is, as a rule, more spacious that in the latter. The posterior part of the antrum lies considerably more externalthan the cavum tympani, so that often a sagittal section passingthrou
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