. Kirkes' handbook of physiology . cerebral vesicle, have grown upward and back-ward, completely covering in and hiding from view practically all the rest of thebrain. At the same time the smooth surface of the cerebral cortex of manylower mammalia, such as the rabbit, is replaced by the labyrinth of convo-lutions of the human brain. When the cerebral hemispheres are removed, several large basal masses of 532 THE \KKVolS SYSTEM nerve substance are revealed: the optic thalami, the corpora quadrigemina,and the cms cerebri. These structures, together with the pons and the medulla,form a direct co
. Kirkes' handbook of physiology . cerebral vesicle, have grown upward and back-ward, completely covering in and hiding from view practically all the rest of thebrain. At the same time the smooth surface of the cerebral cortex of manylower mammalia, such as the rabbit, is replaced by the labyrinth of convo-lutions of the human brain. When the cerebral hemispheres are removed, several large basal masses of 532 THE \KKVolS SYSTEM nerve substance are revealed: the optic thalami, the corpora quadrigemina,and the cms cerebri. These structures, together with the pons and the medulla,form a direct continuation forward of the spinal cord and sometimes are desig-nated under the general term of the brain .sicm. For convenience of description, the physiology of the brain will be presentedby discussing the three main subdivisions: the brain stem, the cerebral hemi-spheres, and the cerebellum. The human brain on superficial examination does not seem to follow thegeneral plan outlined above, but when the cerebral hemispheres and the. Fig. 370.—Diagrammatic Horizontal Section of the Vertebrate Brain. The figures serve bothfor this and the next diagram. Mb, mid-brain; what lies in front of this is the fore-, and whatlies behind the hind-brain; Lt, lamina terminalis; Olf, olfactory lobes; Hmp, hemispheres;Th. E, thalamencephalon; Pn, pineal gland; Py, pituitary body; , foramen of Munro; cs,corpus striatum; Th, optic thalamus; CC, crura cerebri; the mass lying above the canal rep-resents the corpora quadrigemina; Cb, cerebellum; 1-IX, the nine pairs of cranial nerves; 1,olfactory ventricle; 2, lateral ventricle; 3, third ventricle; 4, fourth ventricle; +, iter a tertioad quartum ventriculum. (Huxley.) cerebellum are removed then it is found that what remains closely followsthe plan presented. This central axis, or brain stem, is shown in part infigure 377. The morphological parts of the brain usually given are: 1. The jore-brain, which consists of the corpora striata and the ce
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