Macewen, W: Atlas of Head Sections -

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Résumé :
Excerpt from Atlas of Head Sections: Fifty-Three Engraved Copperplates of Frozen Sections of the Head, and Fifty-Three Key Plates With Descriptive Texts

The way in which the frontal lobes dip downwards near the mesial line infront, and the thin osseous lamella: dividing them from the ethmoidal cells and nasal cavity, are well illustrated in the Anterior Coronal Sections. The proximity of the nasal recesses to the intracranial structures suggests an easy access for erosive infective processes. For eradication of infective matter extending from the nasal fossae through the cribriform plate of the ethmoid, or by way of the frontal sinuses, trephining in the middle line of the brow at the glabella and penetrating the frontal sinuses affords the best means of exposing the seat of disease. It gives free access to the frontal sinuses, to the cribriform plate of the ethmoid, and to both sides of the falx.

The manner in which the basal portion of the temporo-sphenoidal lobe is enclosed on all sides by resisting structures, bone, and dura mater, is well illus trated by, among others, Plates 6, to, 42, 45, and 47. The basal portion of the temporo-sphenoidal lobe has osseous walls to the level of the superior ridge of the petrous bone, and extending beyond that point the unyielding tentorium forms a barrier stretching upward toward the mesial line where it joins the falx above. The base of the temporo-sphenoidal lobe is enclosed, as it were. In a box without a lid. Any pressure arising in the basal portion of the temporo sphenoidal lobe will cause an expansion, chie?y in an upward direction, toward the convolutions of the operculum. The cerebral tissue near the middle line in the vicinity of the internal capsule, having no resisting structure on its inner side, has ample accommodation for displacement toward the lateral ventricle and the opposite side of the brain, and therefore pressure-effects from expansion in the base of the temporo-sphenoidal lobe will affect much less the internal capsule than the upper and outer part of the cerebrum, which is bounded outside and above by the skull, and on the inside by the falx. As a consequence, the bases of the ascending convolutions are more apt to be implicated by pressure exerted from the base of the temporo-sphenoidal lobe.

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