Description of the cerebral hemispheres of an adult Australian male / by H.D. Rolleston.

  • Rolleston, Humphry Davy, 1862-1944.
Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: Description of the cerebral hemispheres of an adult Australian male / by H.D. Rolleston. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    marginal gyrus by the junction of the interparietal sulcus with the horizontal limb of the fissure of Sylvius. The postero-parietal lobule is divided into anterior and posterior portions by a sulcus parallel to and 1 inch in front of the e.xternal parieto-occipital sulcus (half an inch behind the end of the calloso-marginal sulcus). This sulcus joins the inter- parietal sulcus. At the bottom of this anomalous sulcus a small gyrus rising to the surface is visible. The postero-parietal lobule is connected by a bridge to the angular gyrus and by the first annectant gyrus to the superior occipital gyrus. The supra-rnarginal gyrus is quite cut off from tlie ascending parietal gyrus by the interparietal sulcus running into the hori- zontal limb of the fissure of Sylvius. In common with the angular gyrus it is connected with superior temporo-sphenoidal gyrus. Angular gyrus is more convoluted than tlie rest of the hemi- sphere, it is connected to the posterior portion of the postero- parietal lobule, and to the superior but not the middle temporo- sphenoidal gyri. The place where the second annectant gyrus would naturally come off is injured, owing to the fact that in the recent state there was a large Pacchionian body there, but it does not look as if there had been one there. From the angular gyrus an isolated tongue of cortical substance, with sulci 8-12 mm. deep on each side of it, runs forward between (a) the connecting gyrus between the superior temporo-sphenoidal and the supra-marginal and angular gyri, and {h) the annectant gyri from the middle and inferior temporo-sphenoidal gyri. Occipital lohe.—The three gyri are distinct. Of the annectant gyri the first is well developed, as to the second, owing to injuryit is doubtful where it ever existed, the third annectant gyrus has no superficial origin from the middle temporo-sphenoidal gyrus. There is no fourth annectant gyrus. Temporo-sphenoidal lohe.—The parallel sulcus {vide fig. 2) bifurcates posteriorly, and thus encloses what represents the third and fourth annectant gyri, the lower limb of the fissure where it crosses the middle temporo-sphenoidal gyrus is very shallow at first, but deepens (12 mm.) as it approaches the lateral boundary where it joins the inferior temporo-sphenoidal sulcus. Across this shallow limb the middle temporo-sphenoidal gyrus is con- tinuous into the third annectant gyrus. The third annectant gyrus is almost divided into an anterior and posterior portion by a vertical sulcus {h, fig. 2) which starts from the inferior temporo-sphenoidal sulcus at the point where the lower obliquely directed limb of the parallel sulcus joins the inferior temporo-sphenoidal sulcus. This vertical sulcus is 12 mm. in length. [Compare its greater development on the left side.]