Treatise on the ear : including its anatomy, physiology and pathology : for which the author obtained a gold medal in the University of Edinburgh / by Joseph Williams.

Date:
1840
Catalogue details

Licence: Public Domain Mark

Credit: Treatise on the ear : including its anatomy, physiology and pathology : for which the author obtained a gold medal in the University of Edinburgh / by Joseph Williams. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    The petrous portion,'' called sometimes os lapidosum, is of a triangular shape, having a direction forwards and inwards, where its apex joins the basilar processes of the occipital and sphenoid bones. It has an anterior, a posterior, and an inferior surface.^ On the anterior face are found depressions for the middle lobes of the brain, and for the semi-lunar gan- glion ; and on its inner and anterior surface is found the internal opening of the carotid canal, and a little external and superior, the Eustachian tube ; between these two, and superior to both, we trace a groove leading to the foramen innominatum, which gives transmission to the reflected branch of the fifth, and which usually is divided into two or more foramina, and very frequently a complete sulcus or depression is found in the immediate neighbourhood, around which are several minute openings. On the posterior face we find the meatus auditivus internus, allowing the transmission of the portio dura and portio mollis; the former passing through the canal of Fallopius, the latter going to the labyrinth, being the special nerve of hearing. Behind this fora- men is found the aquceductus vestibuli.^ The aquceductus cochlece is situate at the inferior face, between the jugular fossa and the carotid canal. The auricle^ is situated on either side of the head, in front of the mastoid process of the temporal bone. 7 The petrous portion is very soft during the foetal and very early life. The anterior and posterior semi-circular canals are protuberant upon its surfaces.—Bell's Anatomy. 1816. 9 See Cotunnius de Aquaeductibus auris humana?.—Neap. 17GI. 4to. 1 In the foetus the auricle is very soft.
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