. Brains of rats and men; a survey of the origin and biological significance of the cerebral cortex. Cerebral cortex; Rats -- Behavior; Psychology, Comparative; Brain -- physiology; Psychology, Comparative; Cerebral Cortex. 72 BRAINS OF RATS AND MEN point is the enormous size of the organ of smell and the olfactory reflex centers of the brain (Herrick, 1924, chap, xiii and p. 182). A cross-section through the forebrain of a late embryo of this fish shows that its walls contain several separate areas of densely crowded cells (Fig. 7), which Holmgren (1922) and hippocampus general cort-cx hippo
. Brains of rats and men; a survey of the origin and biological significance of the cerebral cortex. Cerebral cortex; Rats -- Behavior; Psychology, Comparative; Brain -- physiology; Psychology, Comparative; Cerebral Cortex. 72 BRAINS OF RATS AND MEN point is the enormous size of the organ of smell and the olfactory reflex centers of the brain (Herrick, 1924, chap, xiii and p. 182). A cross-section through the forebrain of a late embryo of this fish shows that its walls contain several separate areas of densely crowded cells (Fig. 7), which Holmgren (1922) and hippocampus general cort-cx hippo com pus. olfactorq tubercle olfaclorij " bulb lateral olfactorij nucleus medial olfactorLj nucleus Fig. 7.—Diagrammatic cross-section through the forebrain of an embryo of the dogfish, illustrating the cellular arrangement. The fields designated as general cortex and hippocampus are regarded by Johnston (1923) as primordia of the corresponding mammalian cortical fields. Johnston (1923) think are beginnings of true cortex. These sheets of cells are less evident in the adult, and until more is known of their fibrous connections the question must remain undecided. The lungfishes (Elliot Smith, 1908; Holmgren and van der Horst, 1925) show clearer evidence of a poorly developed cortical rudiment in the adult. The shape of the cerebral hemispheres of lung- fishes and amphibians (Fig. 8) is much more like that of higher animals than are those of fishes generally, but the internal organization of these brains is much. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Herrick, C. Judson (Charles Judson), 1868-1960. Chicago, Ill. , The University of Chicago press
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