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.

    34/174 (page 12)
    ]2 and then horizontally forwards to an acute point above the anterior part of the Foramen Ovale, This is the Processus Fallopii. Above the Sulcus Stapedius, and the posterior part of the Processus Fallopii, are several Foramina^ called Fora-^ mina Mastoidea. Leading downwards and backwards from the Foramina Mastoidea, are a number of cells, representing a honey- comb, called Cellules Mastoidece, Before the anterior extremity of the Processus Fallopii is a rough cavity extending obliquely forwards and down- wards, and terminating above the extremity of the Eusta- chian Tube, on the outer surface of the Pars Petrosa. This cavity is generally separated from the Eustachian Tube by a thin Osseous Septum, and is called Sinus Muscu- lar is. Facing the superior and anterior part of the Sinus Muscularis, is a small groove extending from the margin of the Os Annulare to the Fissura Glaseri, called Canalis Anterior. Above the Processus Fallopii and the posterior half of the Sinus Muscularis, is a large rough oblong cavity with its longest diameter extending posteriorly, called Fossa Navicularis. In the posterior superior part of the Cavitas Tympani, and close to the inner surface of the Os Annulare, is a long narrow semilunar depression, called Sulcus Semilunaris. Below the Sinus Muscularis, and a little above and before the basis of the Promontory, is the termination of the posterior extremity of the Canalis Eustachia7ius, The Use of these Parts. The Promontory points out the situation of the pass- age which leads from the Tympanum to the Cochlea, called Scala Tympani. The Eminentia Pyramidalis Tympani points out the situation of the orifice of a canal which runs from the Ves- tibulum to the Cochlea, called Scala Vestibuli.