Some remarks on mal-formation of the internal ear, being the result of post-mortem investigations performed in five cases of congenital deafness / By Mr. Edward Cock. Communicated by Dr. Bright.

  • Bright, Richard, 1789-1858
Date:
1835
Catalogue details

Licence: Public Domain Mark

Credit: Some remarks on mal-formation of the internal ear, being the result of post-mortem investigations performed in five cases of congenital deafness / By Mr. Edward Cock. Communicated by Dr. Bright. Source: Wellcome Collection.

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    ing an appearance like that already described. On the left side, the horizontal and vertical canals ex¬ hibited a similar imperfection. The scala tympani likewise was terminated, at its larger extremity, by a bony septum, which separated it from the tympanum, and occupied the situation of the membrane of the fenestra rotunda. With the exception of these mal¬ formations, and the scrofulous affec¬ tions of the tympanum mentioned above, which were probably of re¬ cent occurrence, no deviation from the healthy state could be dis¬ covered in either of the five subjects examined. The Eustachian tubes were pervious; the bones, muscles, and membranes, entire and natu¬ ral; the labyrinths were filled with their transparent fluid. In no instance did the auditory nerve present any peculiarity, although carefully traced from its origin to its distribution. The chorda tympani was present in every instance, but I cannot vouch for the integrity of all the little nervous fibrillae, which pass into the tympanum and ramify on its walls, requiring the aid of a microscope for their dissection. In addition to these two cases of mal-formation i may state a third, which was dissected by my friend Mr. Dalrymple, and is now in his possession. In this instance, the aqueduct of the vestibule was so large as to admit the passage of a small probe.