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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    In one instance, the petrous bone of a child twelve years old, exceeded in size, hardness, and compact¬ ness of structure, that of any adult which I have witnessed. The mal-formation which I discovered in two in¬ stances, may be described in a few words. It con¬ sisted in a partial deficiency of two of the semi-circu¬ lar canals. The extremities of these tubes opening into the vestibule were perfect, but the central por¬ tions were impervious, or rather did not exist at all. In the first case, I had the opportunity of examining the ear from one side only *. The vertical and oblique semi-circular canals were both impervious at their central portions. The accompanying diagram will render the state of the parts easily understood, making some allowance for the false perspective which I have had recourse to, in order to exhibit all the canals in one view. ✓ The defective portions of the canals are traced out with dotted lines. In the second case both ears were examined. On the right side, the middle portions of the oblique and vertical canals were wanting, the bone present- * This examination was made in the month of November, 1832.