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The hippocampal formation or archicortical division of the rhinecephalon of the bottlenose dolphin, Tursiops truncatus, is described from the standpoint of its gross topographic relations and cytoarchitecture. A feature of the dolphin brain, which lacks olfactory bulbs and peduncles, is the striking reduction of the archicortical relative to the(More)
The frequency of occurrence and amplitude of hippocampal theta waves induced by forced locomotion is proportional to speed of movement on a treadmill. Although induction of hippocampal theta waves is related to the initiation of movement, it is not dependent upon proprioceptive feedback because it persists in the resting animal after a bout of running. It(More)
The large insula of the bottlenose dolphin consists of radial gyri arising, in fanlike fashion, from the transverse insular gyrus, and is covered completely by the frontal, parietal, and temporal opercula . On cytoarchitectonic grounds, the dolphin insula is divided into anterior, middle, and posterior sectors that may be the equivalent of the three similar(More)
In these cytoarchitectonic studies of the cortical limbic formations of the bottlenose dolphin and other whale brains we have carried out quantitative analyses of the entire limbic lobe, including all of its sectors: supracallosal, retrosplenial and temporal. The limbic lobe proper has been examined as well as transitional areas between the limbic lobe and(More)