septum pellucidum

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A thin, double partition extending down from the lower surface of the corpus callosum to the fornix and adjacent structures, separating the lateral ventricles of the brain and enclosing an area above the third ventricle. It is part of the limbic system and one of the most important of the pleasure centres of the brain, electrical stimulation of this area producing intensely agreeable sensations of well-being in humans. Experimental rats with access to levers to control the output of electrodes implanted semi-permanently in their septal areas self-stimulate themselves for long periods to the virtual exclusion of food, sex, and sleep, whereas ablation of the area leads to septal rage. Also spelt septum pelucidum. Also called the septum, septal area, septal nucleus, septal region, or septum lucidum. septa pellucida pl. [From Latin saeptum a fence or enclosure, from saepire to fence or enclose + pellucidus transparent, from per through + lucere to shine]

Subjects: Psychology.

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