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第三节脑本节主要闡述脑的构造和它的机能,从量力性的观点出发,教材仅介紹延髓、小脑和大脑三个部分,这是适合实际情况的。延髓的机能着重的介紹了几个神經中枢的机能——呼吸中枢、心搏中枢、血管舒縮中枢和唾液分泌中枢。这几种中枢的机能在上冊各章部已敍述了一些感性知識,例如講到血的流动时就举出肌肉活动加强时,它里面毛細血管舒张的数目就多一些。这一段內就把这些感性知識提高到理論來認識,进一步加深和巩固反射的概念。同时还为講高級神經活动打下基础。例如唾液分泌中枢的位置等。
The third section of the brain This section mainly describes the structure of the brain and its function, from the quantitative point of view, the textbook only describes the medulla oblongata, cerebellum and brain three parts, which is suitable for the actual situation. The function of medulla oblongata focuses on the functions of several nerve centers - the respiratory center, the heartbeat center, the vasomotor center and the salivary secretion center. The functions of these centers have been described in the Chapters of the Book. Some sensory knowledge, for example when referring to the flow of blood, shows the greater number of telangiectasias when muscle activity is increased. In this paragraph, we put these perceptual knowledge into theory to understand and further deepen and consolidate the concept of reflection. It also laid the foundation for advanced neuronal activities. Such as salivary secretion center location.