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5. Notes more especially on the Bridging Convolutions in the Brain of the Chimpanzee

Published online by Cambridge University Press:  15 September 2014

Wm. Turner
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Extract

The late Professor Gratiolet, in his elaborate and beautifully illustrated memoir, “Sur les Plis Cérébraux de l'Homme et des Primates,” attaches great weight in his differential diagnosis of their cerebral characters to the presence or absence of one or more members of a series of convolutions, which he designates as the plis de passage. When present, these convolutions bridge over the external perpendicular fissure of the hemisphere, and connect the parietal and temporal with the occipital lobes. By various anatomists in this country they are called bridging, connecting, or annectent convolutions. In the brain of the Chimpanzee M. Gratiolet states that the first bridging convolution is altogether wanting; that the second is present, but concealed under the operculum of the occipital lobe; that the third and fourth are superficial.

Type
Proceedings 1865-66
Information
Proceedings of the Royal Society of Edinburgh , Volume 5 , 1866 , pp. 578 - 587
Copyright
Copyright © Royal Society of Edinburgh 1866

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References

page 579 note * Natural History Review, 1861, p. 211.

page 579 note † Natural History Review, 1861, p. 309.

page 586 note * But few specimens of the brain of the Chimpanzee have as yet been figured or described. In that figured by Tyson, only the base and an internal view of the brain are given. In the brains figured and described by Gratiolet, and Van der Kolk and Vrolik, and in my brain (C) no superior bridging convolution existed. In the brains described by Rolleston and Marshall, as well as in the brains A and B now described, it is precisely stated that it was present in one hemisphere. In the brain figured by Tiedemann (Phil. Trans. 1836), from a specimen in the Hunterian Museum, London, it is apparently present in the left hemisphere, though it is not referred to in the description; and from the drawing of a careful cast of the brain dissected by Dr Macartney (Trans. Royal Irish Acad 1843), it seems probable that the first bridging convolution existed in his specimen.

Addendum, May 5.—Since the above paper was read, a fine young male Chimpanzee has been purchased by Professor Goodsir for the Anatomical Museum, the brain of which I removed and examined. In both hemispheres the parieto-occipital fissure was unbridged, and the opercular edge of the occipital lobe was as sharp andwell defined as in my brain (C), or in the specimen figured by Gratiolet.