. The pathological anatomy of the ear . Fig. 53. Fig. 51. Rupture of the Drum-membrane, from a blow on the ear. From Toyn-bee, Diseases of the Ear, p. 182. Fig. 52. Rupture of an atrophied Drum-membrane, from violent inflation byYalsal-as method. From Toynbee, Ibid., p. ]83. Fig. 53. Rupture of the Drum-membrane, from a person who was hanged. Seenfrom the tympanum. indirectly from air pressure (explosion, box on theear, diving, and from whooping cough); also, fromfractures of the skull, and from violent concus-sions of the petrous bone. The edges of a rupturefrom a direct wound are generally i
. The pathological anatomy of the ear . Fig. 53. Fig. 51. Rupture of the Drum-membrane, from a blow on the ear. From Toyn-bee, Diseases of the Ear, p. 182. Fig. 52. Rupture of an atrophied Drum-membrane, from violent inflation byYalsal-as method. From Toynbee, Ibid., p. ]83. Fig. 53. Rupture of the Drum-membrane, from a person who was hanged. Seenfrom the tympanum. indirectly from air pressure (explosion, box on theear, diving, and from whooping cough); also, fromfractures of the skull, and from violent concus-sions of the petrous bone. The edges of a rupturefrom a direct wound are generally irregular, jagged,and suffused with blood; those of a rupture from in-direct force almost always show a clean fissure parallel 90 PATHOLOGY OF THE EAR. to the radial fibres of the membrane. The ruptureswhich are seen in artillerists often run parallel to andbehind the manubrium. When ruptures occur froma moderate air-pressure, it will usually be found thatthe anatomical condition of the drum-membrane pre-disposed thereto, atrophy or cal
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