Comparative studies on the growth of the cerebral cortex. I. On the changes in the size and shape of the cerebrum during the postnatal growth of the brain. Albino rat
Comparative studies on the growth of the cerebral cortex. I. On the changes in the size and shape of the cerebrum during the postnatal growth of the brain. Albino rat
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大脑皮层生长的比较研究。
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Naoki Sugita
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作者：
Naoki Sugita
本研究是对白化大鼠产后大脑皮层厚度生长情况的初步研究。为此，有必要了解出生后生长过程中发生的以大脑为代表的大脑形状和大小的变化，并以线性测量的形式记录这些变化。大脑的生长，以体重的增加为代表，在“The Rat”（Donaldson，'15）中列出。然而，到目前为止，我们还没有关于大脑（或大脑）的形状和尺寸与体重或年龄增加之间关系的记录。 Hatai ('07) 对 matuie 白化老鼠的头骨进行了详细的测量，从中我们可以推断出成年白化老鼠大脑的形状和大小，但不包括年轻阶段的测量。作为这项研究的第一步，我必须确定整个大脑的重量与生长过程中大脑的重量之间存在的关系。为了进行更详细的研究，唐纳森将整个大脑分为四个部分，即大脑、干、小脑和嗅球，并研究了出生后生长过程中每个部分的重量增加以及它们之间的重量关系的变化（未发表的观察结果，部分发表于1916年12月的哈维讲座）。根据我的类似调查，
The present study is preliminary to an investigation on the postnatal growth of the cerebral cortex in thickness, in the case of the albino rat. For this purpose it was necessary to learn the changes in shape and size of brain-represented by the cerebrum -which occur during postnatal growth and to record these changes in terms of linear measurements. The growth of the brain, as represented by increase in weight, is tabulated in “The Rat” (Donaldson, ’15). As yet however we have no records concerning the shape and dimensions of the brain-or cerebrum-in relation to increasing weight or age. Hatai (’07) has given detailed measurements on the skull of matuie albino rats, from which we can infer approximately the shape and size.of the adult albino rat brain, but measurements for the younger stages were not included. As a first step in this study, I had to ascertain the relation existing between the weight of the entire brain and of the cerebrum during growth. For the purpose of a more detailed study, Donaldson has divided the entire brain into four parts, i.e., the cerebrum, the stem, the cerebellum and the olfactory bulbs, and investigated the increase in weight of each of these parts and the changes in the weight relations among them, during postnatal growth (unpublished observations, partly presented in a Harvey Lecture, December, 1916). From a like investigation on my part,