. A treatise on nervous and mental diseases, for students and practitioners of medicine. gular, and have a large nucleus. The third layer is composedof similar pyramidal cells that are somewhat more elongated andhave a tendency to grow larger as they lie deeper in the cortex, andthey each have a long, delicate apex process. The fourth layer ismade up of the great uerve cells, which are known as the motor cellsor ganglionic cells of Betz. The fifth layer consists of a series ofspindle cells. Fig. 11 represents these five series of cells from thebrain of a rabbit, as depicted by Bevan Lewis. Bev
. A treatise on nervous and mental diseases, for students and practitioners of medicine. gular, and have a large nucleus. The third layer is composedof similar pyramidal cells that are somewhat more elongated andhave a tendency to grow larger as they lie deeper in the cortex, andthey each have a long, delicate apex process. The fourth layer ismade up of the great uerve cells, which are known as the motor cellsor ganglionic cells of Betz. The fifth layer consists of a series ofspindle cells. Fig. 11 represents these five series of cells from thebrain of a rabbit, as depicted by Bevan Lewis. Bevan Lewis hasmade a most elaborate study of the structure of the cortex in thebrains of such lower animals as the rabbit and cat, as Avell as of thehuman brain, and he lias very precisely delineated the type ofstructure that is ])eculiar to each portion of the cortex, and hasthus found that there are eight different types instead of five, asIMeynert has stated. There are many resemblances between thestructure of the human brain and that of these lower animals. 30 INTRODUCTORY, Fig.
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