Compendium of regional diagnosis in affectations of the brain and spinal cord / Translated by F.S. Arnold.

  • Bing, Robert.
Date:
1913
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Licence: In copyright

Credit: Compendium of regional diagnosis in affectations of the brain and spinal cord / Translated by F.S. Arnold. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    is drawn in an analogous manner, but from the posterior border of the mastoid process. The points a and 6 divide the pre-auricular Hne into three equal parts; c bisects it. If the trephine is applied between c and h, the lower end of the central convolutions will be reached, which in adults generally lies about 7 centimetres above the auditory meatus. The lower end of the central fissure often lies directly under the pre-auricular line. In our figure it is represented as reaching farther forward, for two types of relation between the brain and the outer cranial wall may be recognized—a froniopetal type, as represented in our Fig. 73. Projection of the Middle Meningeal Artery and the Transverse Sinus on the External Surface of the Skull. figure, and an occipitopetal type, in which the different fissures and convolutions lie rather farther back. The post-auricular line crosses the upper end of the central fissure. The fissure of Sylvius will be met with about 1 to li centimetres below the lower end of the central fissure. For some distance the Sylvian fissure lies immediately beneath the squamous suture. Under the parietal tuberosity lie, as a rule, the upper end of the fissure of Sylvius and the supramarginate gyrus.