SIZE AND SHAPE OF THE CEREBRAL-CORTEX IN MAMMALS .1. THE CORTICAL SURFACE
SIZE AND SHAPE OF THE CEREBRAL-CORTEX IN MAMMALS .1. THE CORTICAL SURFACE
复制标题
DOI：
10.1159/000118718
复制
发表时间：
1985-01-01
影响因子：
1.7
通讯作者：
HOFMAN, MA
中科院分区：
文献类型：
--
作者：
HOFMAN, MA
哺乳动物大脑的进化一直伴随着大脑皮层的逐渐扩大。对该皮层体积、表面积和卷曲度的异速分析表明，在哺乳动物中可以区分出两大类：(1)无脑脑的物种，其表面积-体积关系由线性几何定律决定；(2)脑回脑的物种，其严格的几何相似性不再适用。需要不同的数学模型来描述这些群体的大脑形态。此外，有研究表明，在具有卷曲大脑的物种中，海洋哺乳动物（鲸科）形成了一个亚群，因为这些动物的大脑皮层表面比脑大小相似的陆地哺乳动物更折叠。因此，在研究尺寸增加对大脑几何形状的影响时，使用单一的异速关系，而不考虑卷积度或生态策略，就像以前的研究一样，是不合理的，并且模糊了哺乳动物大脑结构组织的差异。最后，提出了一个无量纲的皮质折叠指标，表明皮质折叠的程度不仅取决于大脑或皮质的体积，还取决于皮质的厚度。
The evolution of the brain in mammals has been accompanied by a progressive enlargement of the cerebral cortex. Allometric analysis of the volume, surface and convolutedness of this cortex shows that among mammals two major groups can be distinguished: (1) species with lissencephalic brains, where surface-volume relationships are determined by linear geometric laws, and (2) species with gyrencephalic brains, where strict geometric similarity no longer applies. Different mathematical models are required to describe the brain morphology in these groups. It has been shown, moreover, that among species with convoluted brains, marine mammals (Cetaceae) form a subgroup in that the cerebrocortical surface in these animals is more folded than in terrestrial mammals of similar brain size. Thus it appears that the use of a single allometric relation in studying the effect of size increase on the geometry of the brain.sbd.irespective of convolutedness or ecological strategy.sbd.as has been done in previous studies, is unjustified and obscures the differences in the structural organization of mammalian brains. Finally, a dimensionless index of cortical folding is proposed, which indicates that the degree of cortical folding depends not only on the volume of the brain or cortex but on cortical thickness as well.