Archive image from page 680 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Fig. 575.—Diagrams to explain Three Types of Cerebral Furrotvs. the frontal pole, whilst the most projecting part of the posterior end is termed the occipital pole. On the inferior surface of the hemisphere the prominent point of cerebral substance which extends forwards below the lateral fissure receives the name of the temporal pole. In a well-hardened brain a broad groove is usually present on the medial and inferior aspect of the occipital pole of
Archive image from page 680 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Fig. 575.—Diagrams to explain Three Types of Cerebral Furrotvs. the frontal pole, whilst the most projecting part of the posterior end is termed the occipital pole. On the inferior surface of the hemisphere the prominent point of cerebral substance which extends forwards below the lateral fissure receives the name of the temporal pole. In a well-hardened brain a broad groove is usually present on the medial and inferior aspect of the occipital pole of the right hemisphere. This corresponds to the commencement of the right transverse venous sinus. A less distinct groove on the occipital pole of the left hemisphere frequently indicates the commencement of the left transverse sinus. On the tentorial surface, a short distance behind the temporal pole, a well-marked depression, impressio petrosa, is always visible. This corresponds to the elevation on the anterior surface of the petrous portion of the temporal bone over the superior semicircular canal. The White Matter of the Cerebral Hemispheres. According to the connexions which they establish the fibres forming the white medullary matter of the hemispheres may be classified into three distinct groups, viz., (1) commissural fibres; (2) association fibres; and (3) projection fibres. Commissural Fibres.—These are fibres which link together portions of the gray cortex of opposite cerebral hemispheres. They are arranged in three groups forming three definite structures, viz., the corpus callosum, the anterior commissure, and the hippocampal commissure. The corpus callosum has in a great measure been already studied (p. 628). As it enters each hemisphere, its fibres spread out in an extensive radiation (the radia-
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