The Anatomy and physiology of the organ of hearing : with remarks on congenital deafness, the diseases of the ear, some imperfections of the organ of speech, and the proper treatment of these several affections / By David Tod.

  • Tod, David.
Date:
1832
Catalogue details

Licence: Public Domain Mark

Credit: The Anatomy and physiology of the organ of hearing : with remarks on congenital deafness, the diseases of the ear, some imperfections of the organ of speech, and the proper treatment of these several affections / By David Tod. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    Annulare, which as the child advances in age gradually unites with^ and becomes a portion of, the Adult Temporal Bone. In children, the Os Annulare is easily separated from the Temporal Bone by maceration. The circle of the Os An- nulare is never quite complete; the imperfect part corre- sponds with the root of the Zygomatic and Squamous Pro- cesses. The Petrous Portion of the Temporal Bone is, in the adult, one of the hardest bones; in the foetus and new- born child, however, it is one of the softest osseous struc- tures in the Body. Directions how to expose the Apparatus Tympani without doing the textures much injury. Take the Temporal Bone of an Infant or Foetus, and after injecting it, remove all the soft parts from its surface, ikeeping the Membrana Tympani entire \ then introduce 'the point of a small scalpel between the Os Annulare and ithe Petrous Portion on the under surface, and separate the lone gently from the other, so as to raise the two inferior [thirds of the former about a quarter of an inch from the latter, and put a small piece of wood between them until the parts become quite dry. The different parts will then remain permanently in situ^ only a little on the stretch. Again; take another Temporal Bone of the same age, and gradually remove the osseous shell which forms the upper part of the Fossa Navicularis and the inferior part of the Cavitas Tympani, and put the preparation aside to dry. Every texture will then appear in situ, and in a state of integrity. By repeating these dissections with slight alter- ations, every structure will be demonstrated in a variety of ways.