Does the Stria Terminalis Carry Information Concerning Feeding and Body Weight Regulation from the Posterodorsal Amygdala to the Hypothalamus?
University of New Orleans, 2005 - 77 pages
Previous research has demonstrated body weight gain in rats after lesions to the posterodorsal amygdala. Likewise, a recent study also found increased body weight as a result of knife-cuts of the stria terminalis, just as it exits the amygdala. In the present study, these findings were extended and previous studies replicated by producing (1) lesions in the stria terminalis as it travels dorsally through the brain, (2) coronal knife-cuts anterior to the ventromedial hypothalamus, and (3) axon-sparing lesions of the posterodorsal amygdala using ibotenic acid. Both lesions of the dorsal stria terminals and coronal knife-cuts anterior to the ventromedial hypothalamus resulted in significant weight gain to female rats as compared to controls. The failure of previous research to find effects after these treatments is attributed to the use of male animals. In addition, examination of anterograde degeneration using an amino-cupric-silver stain in two rats with knife-cuts revealed degenerating terminals to the shell of the VMH and the premammillary nuclei, indicating that the dorsal component of the stria terminalis had been severed. The results of ibotenic acid lesions of the posterodorsal amygdala are unable to be reported due to the inability to histologically verify the lesions. This may have been caused by acid seepage into the lateral ventricles. While the amygdala can not be confirmed as the origin of information concerning body weight regulation and food intake, stria terminals does seem to carry this information, exerting an inhibitory influence on the ventromedial hypothalamus.
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