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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    The parallel sulcus was far from normal, 2| inches from the anterior extremity of the temporo-sphenoidal lobe it is joined at right angles by a sulcus {a, PI. II, hg. 1) which arises from the inferior temporo-sphenoidal sulcus. The second and third temjioro-sphenoidal gyri are thus separated from the third and fourth annectant gyri. [Compare with so-called bifurcation of parallel fissure on right sidc3.] From this point tlie parallel fissure is continued posteriorly for 2 inches, it then bifurcates and tends to cut off the occipital lobe from its third and fourth annectant gyri. At the point of bifurcation the sulcus is deep, the limbs, however, are shallow. The lobes.—Frontal lobe.—The superior middle and inferior frontal gyri are blended superficially at their anterior extremity, their arrangement is otherwise simple. It may be worth while noting that there is a tendency to four instead of usual three longitudinal gyri. The ascending frontal gyrus is connected to the superior frontal by a large bridge, and to the inferior frontal gyrus by a small bridge, otherwise it is distinct and is not connected to the middle frontal gyrus. Orbital surface, smoother than on the right side. The tri- rad iate sulcus is fairly distinct. The 'parietal The ascending parietal gyrus is quite isolated except for two small bridges of cortex which connect it, the one to the ascending frontal gyrus, the other to the postero- parietal lobule. The postero-parietal lobule is joined by a small bridge to the supra-marginal gyrus. Painning transversely into the postero- parietal lobule from the longitudinal fissure is seen a sulcus, which is, however, not so well developed as the one on the right side, it does not run into the interparietal sulcus, and hence the postero-parietal lobule is not divided into two separate halves, anterior and posterior, as is the case on the other side. The fir.st annectant gyrus is small superficially. The supra-marginal gyrus is cut off from the ascending parietal gyrus by tlie interparietal sulcus and is joined to the superior temporo-sphenoidal gyrus by a gyrus (half an inch across). As mentionecl above, a gyrus breaks across tlie interparietal sulcus at its anterior superior border to join the postero-parietal lobule. The angular gyrus is distinct and is better marked off than on the right side. The second annectant gyrus is distinct. In common with the supra-marginal, the angular gyrus is connected to the superior temporo-sphenoidal, but not to the middle temporo-sphenoidal gyrus.