. The pathological anatomy of the ear . her-of-pearl, the morphological elements of whichare chiefly flat cells of polygonal shape (epidermalcells), and also often, but not constantly, crystals ofcholesterine in small numbers. (According to Lucae,they contain also nucleated giant cells.) ^ In those cases in which a true new growth ex-ists, all inflammatory irritation in the neighborhood iswanting in the ear-lier stages of its de-velopment, and sup-puration with a de-structive tendencyis only shown later,when we may luiveperforation of themembrana tympani,or the bone of theupper wall of themeat
. The pathological anatomy of the ear . her-of-pearl, the morphological elements of whichare chiefly flat cells of polygonal shape (epidermalcells), and also often, but not constantly, crystals ofcholesterine in small numbers. (According to Lucae,they contain also nucleated giant cells.) ^ In those cases in which a true new growth ex-ists, all inflammatory irritation in the neighborhood iswanting in the ear-lier stages of its de-velopment, and sup-puration with a de-structive tendencyis only shown later,when we may luiveperforation of themembrana tympani,or the bone of theupper wall of themeatus, or of the sul-cus transversus, wdthopening into themiddle or posteriorfossa of the skull. That cholesteato-ma may appear as a true new growth in the middleear, has been lately fully established on dissection byLucae/ as he found with the growth neither inflamma-tion of the tympanum nor perforation of the mem-brana tympani. ^ R. Volkmann, Knochenkrankheiten, S. 487, places the cholesteatomamidway between cancroid and Circumscribed Atrophy of the Sulcus Transver-sus from cholesteotnma, with erosion of the sinus(otorrhagia). Antrum mastoideum and tympanumwith smooth walls, and much enlarj^ed by atrophyfrom pressure. The opening into the sulcus meas-ures 11 mm. in length and 5-6 mm. in breadth,and has perfectly smooth edges. 24 PATHOLOGY OF THE EAR. In the great majority of cases of so-called choles-teatoma in the temporal bone, we are dealing withnothing more than a retention of inflammatoryproducts, the result of suppurative processes (VonTroeltsch). A collection of concentric layers of epi-dermis cells and. occasional masses of cholesterinecrystals form around a nucleus of fatty and caseouspus; the connective tissue capsule is wholly cause of these collections is purulent catarrh ofthe middle ear, with polypoid granulations and per-foration of the membrana tympani. Such collections are found in the natural cavities, most frequent-ly in the an-tru
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Keywords: ., bookcentury1800, bookdecade1870, bookidpa, booksubjecteardiseases
