EFFECT OF INTERHEMISPHERIC SECTIONS OF THE HYPOTHALAMUS ON MILK-EJECTION BURSTS OF SUPRAOPTIC OXYTOCIN NEURONS DURING BILATERAL AND UNILATERAL SUCKLING IN THE RAT

Citation
Yf. Wang et al., EFFECT OF INTERHEMISPHERIC SECTIONS OF THE HYPOTHALAMUS ON MILK-EJECTION BURSTS OF SUPRAOPTIC OXYTOCIN NEURONS DURING BILATERAL AND UNILATERAL SUCKLING IN THE RAT, Neuroscience letters, 227(1), 1997, pp. 17-20
Citations number
12
Categorie Soggetti
Neurosciences
Journal title
ISSN journal
03043940
Volume
227
Issue
1
Year of publication
1997
Pages
17 - 20
Database
ISI
SICI code
0304-3940(1997)227:1<17:EOISOT>2.0.ZU;2-I
Abstract
The burst activity of oxytocin neurones was recorded from the supraopt ic nucleus of lactating rats with or without interhemispheric sectioni ng of the hypothalamus during bilateral or unilateral suckling. The re sults showed that extensive interhemispheric sectioning did not abolis h the burst of oxytocin neurones during bilateral and contralateral su ckling (100% of 25 neurones and 95% of 20 neurones, respectively), but significantly reduced the number of oxytocin neurones that showed the burst during ipsilateral suckling (5.3% of 19 neurones). To orientate the crossing site of the signals for bilateral synchronization of the bursts of oxytocin neurones, interhemispheric sectioning of the rostr al or caudal hypothalamus was attempted, but either sectioning partial ly blocked the occurrence of the bursts during ipsilateral suckling. T hese results suggest that there are two separate gates located on diff erent sides of the hypothalamus and that the neural connections betwee n the gates seem distributed diffusely. (C) 1997 Elsevier Science Irel and Ltd.