. The pathological anatomy of the ear . Fig. 33. Fig 34. Fig. 31. Calcification.^ in the Drum-membrane. Figs. 32 and 33. Calcitications and Cicatrices. Fig. 34. Calcitication of the whole Drum-membrane seen from within, with a cic-atricial formation in the posterior upper quadrant. The calcified membrane projectssharply into the tympanum and is as hard as bone. The most common form of calcification is a crescentbefore or behind the manubrium ; the horse-shoe vari-ety is less common. In the highest degrees of calcifi-cation the deposit extends over the whole memlsrane,but this occurs only after
. The pathological anatomy of the ear . Fig. 33. Fig 34. Fig. 31. Calcification.^ in the Drum-membrane. Figs. 32 and 33. Calcitications and Cicatrices. Fig. 34. Calcitication of the whole Drum-membrane seen from within, with a cic-atricial formation in the posterior upper quadrant. The calcified membrane projectssharply into the tympanum and is as hard as bone. The most common form of calcification is a crescentbefore or behind the manubrium ; the horse-shoe vari-ety is less common. In the highest degrees of calcifi-cation the deposit extends over the whole memlsrane,but this occurs only after suppurative processes. Thedrum-membrane is then transformed into a perfectlyrigid stony plate, sometimes of considerable thick-ness (2-3 mm.). 70 PATHOLOGY OF THE EAR. Besides the crescentic form the deposits of lime oc-cur as irregular and radiating striations from the endof the manubrium towards the periphery of thedrum-membrane, A central calcification surrounding the manubriumis very rare. Beginners in otoscopy can easily mis-take
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Keywords: ., bookcentury1800, bookdecade1870, bookidpa, booksubjecteardiseases
