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Journal of Biological Rhythms
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Knife Cuts Lateral but Not Dorsal to the Hypothalamic Paraventricular Nucleus Abolish Gonadal Responses to Photoperiod in Female Hamsters (Mesocricetus auratus)

Lori L. Badura

Psychology Department and Neuroscience Program, Michigan State University, East Lansing, Michigan 48824-1117

Kimberly K. Kelly

Psychology Department and Neuroscience Program, Michigan State University, East Lansing, Michigan 48824-1117

Antonio A. Nunez

Psychology Department and Neuroscience Program, Michigan State University, East Lansing, Michigan 48824-1117

Horizontal and parasagittal knife cuts in the hypothalamus of female hamsters (Mesocricetus auratus) were employed to investigate the neural pathways that mediate go nadal responses to photoperiod. Bilateral horizontal knife cuts placed dorsal to the paraven tricular nucleus (PVN) did not prevent short-day-induced acyclicity and uterine regression. On the other hand, regardless of photoperiod, animals with bilateral parasagittal knife cuts placed lateral to the PVN continued to exhibit regular 4-day estrous cycles and stimulated uteri. Thus, parasagittal cuts prevented the effects of short days on reproductive physiology. This finding suggests that the lateral efferent projections from the PVN represent an important component of the neural pathway mediating reproductive photoperiodism in female hamsters.

Journal of Biological Rhythms, Vol. 4, No. 1, 79-91 (1989)
DOI: 10.1177/074873048900400106
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