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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    The Basis is of a semicircular figure, corresponding to the shape and size of the Foramen Ovale, into which it is received and attached by a part of the Membrana Pro- pria Tympani, and apparently also by a ligament which extends from the posterior surface of the Foramen to the small process which projects from its posterior margin. Its surface next the Membrane of the Fenestra is a little convex and smooth, and that next the Cavitas Tympani is a little concave. The Malleus is named from the resemblance it is said to bear to a hammer; but it is more like a pistol than that instrument. It is divided into a Head, a Cervix, a Handle, and two Processes, one extending from the Cervix, the other from the Handle. When the bone is in situ, its Head is turned obliquely upwards, inwards and a little backwards, into the anterior part of the F'ossa JVavicularis, and the cavity in the body of the Incus; its Cervix obliquely down- wards and outwards towards the Meatus Auditorius Ex- ternus ; its Handle obliquely downwards and inwards, so as to have the apex near the middle of the Membrana Tympani; its process from the Cervix, called Processus Gracilis, obliquely forwards and downwards, in the Ca- nalis Anterior; and its process in the Handle, called Pro- cessus Brevis, obliquely outwards and upwards. The Head is the largest and strongest portion of the bone, apd is of an irregular oval figure, with a slight ob- lique depression on its posterior surface, which, in the recent subject, is covered with cartilage, surrounded with a capsular ligament, and articulated with the depression in the body of the Incus, forming a Ginglymoid Joint. The Cervix is situated immediately below the Head in such a manner as to give the two the appearance of the butt end of a pistol. The Handle, or Manubrium, forms an obtuse angle with the Head and Cervix, is of considerable length, and some- what triangular, becoming gradually smaller and thinner c