Abstract
IN his work on the “Convolutions of the Human Brain” Ecker denies explicitly that the first and second external bridging convolutions of Gratiolet, as seen in Cercopithecus, Inuus, &c., are ever concealed, either in the higher apes or in fœtal or adult man. I have however in my possession an adult human brain in which a convolution nearly corresponding in position to the external bridging one of Gratiolet is concealed, while another slightly external to it is nearly so. The brain was hardened in nitric acid with the membranes on (a much preferable method, by the by, to that of first removing the membranes; as these, by absorbing the acid and swelling, serve, like so many wedges, to keep the convolutions apart, and prevent the shrinkage that otherwise takes place). There was no indication of any concealed convolution until the membranes, just moistened for the purpose with water, were being removed. Then, owing to the opening out of the sulcus occipitalis transversus of Ecker, the tip of one became visible, and this tip, even now that the edges of the sulcus are widely separated, is from one-eighth to one-sixth of an inch beneath the general surface.
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CARTER, W. Concealed Bridging Convolutions in a Human Brain. Nature 23, 556 (1881). https://doi.org/10.1038/023556a0
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DOI: https://doi.org/10.1038/023556a0
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