Abstract
Intraperitoneal injection of pilocarpine (380 mg/kg) produces motor limbic seizures in rats. Focal injection into the prepiriform cortex (PC) of an N-methyl- d-aspartate receptor antagonist, 2-amino-7-phosphonoheptanoic acid (APH), 1 10 pmol, potently protects against these seizures and their pathological consequences. Sites similarly sensitive to the protective action of APH are found along a substantial part of the anterior-posterior extension of the piriform cortex. More caudal injection sites, located at the level of lateral septum are less sensitive. The anticonvulsant action of APH along the extent of the PC is localised in the vicinity of the injection site, as shown by autoradiography following focal injection of tritiated APH.
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