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Cited by 185Hypothalamic control of reproductive hormonesOlfactory and Sensory Function StudiesNeuroendocrine regulation and behavior

Differential projections of the anterior and posterior regions of the medial amygdaloid nucleus in the Syrian hamster

Gomez, Diana M., Newman, Sarah Winans·1992·Journal of Comparative Neurology
DOI 10.1002/cne.903170208
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Abstract

The medial nucleus of the amygdala is important for the neural control of reproductive behavior in the adult male Syrian hamster. Two types of signals are essential for this behavior, chemosensory stimuli and gonadal steroids; these signals appear to be received in different parts of the medial nucleus. The anterior region receives input from olfactory and vomeronasal systems, both of which are required for this behavior, whereas the posterior region receives gonadal hormone inputs. Behavioral studies have also suggested a functional differentiation of these two areas; electrolytic lesions of the anterior, but not the posterior, part eliminates normal sexual behavior. In this study, the efferent projections of the anterior and posterior divisions of the medial nucleus of the amygdala in the Syrian hamster were analyzed throughout the forebrain after injections of the anterograde neuronal tracer, Phaseolus vulgaris-leucoagglutinin. Neurons of the anterior, but not the posterior, medial nucleus, were found to project to numerous olfactory bulb projection areas and to the ventral striatopallidal complex. Within areas of the chemosensory circuitry that control reproductive behavior, the anterior region of the medial nucleus projects to the intermediate part of the posterior bed nucleus of the stria terminalis and the lateral part of the medial preoptic area, whereas the posterior region of the medial nucleus projects to the medial parts of these areas. Differences in targets were also observed in the ventromedial nucleus of the hypothalamus where the anterior region projects to the core while the posterior part projects to the shell of this nucleus. Furthermore, reciprocal projections between the anterior and posterior regions of the medial nucleus were observed. Taken together, these studies support the hypothesis that the anterior and posterior regions of the medial amygdaloid nucleus provide substantially different contributions to the control of reproductive behaviors.

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Authors
Gomez, D. M., & Newman, S. W.
Affiliations
University of Michigan (US)
Venue
Journal of Comparative Neurology
Publisher
Wiley
Published
1992-03-08
Volume
317
Issue
2
Pages
195-218
ISSN
  • 0021-9967 (ISSN-L)
  • 1096-9861
DOI
10.1002/cne.903170208
OpenAlex
W2094469610
Cited by
185
References
59
Citations by year
2025: 1 · 2024: 2 · 2023: 3 · 2022: 4 · 2020: 5 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 5 · 2015: 1 · 2014: 6 · 2013: 7 · 2012: 5
FWCI
7.56
Type
journal article
Language
en
Open access
closed
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 4598 d)
Locations
  • The Journal of Comparative Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Deep Blue (University of Michigan) (submittedVersion)
Funders
  • National Institutes of Health (2r01ns020629-05)
  • National Institute of Neurological Disorders and Stroke (NS-20629)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Sensory Systems › Olfactory and Sensory Function Studies
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
Keywords
medial amygdala, efferent projections, golden hamster, male reproductive behavior, olfactory bulb, vomeronasal system, bed nucleus of the stria terminalis, medial preoptic area, ventromedial hypothalamus, reciprocal projections
MeSH terms
Amygdala, Animals, Brain Mapping, Corpus Striatum, Efferent Pathways, Globus Pallidus, Cricetinae, Hypothalamus, Male, Mesocricetus, Olfactory Pathways, Preoptic Area, Sexual Behavior, Animal, Thalamus

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