Immunohistochemical Localization of Oxytocin on Hypothalamus in Dairy Goat during Midgestation

The immunohistochemical SP method was used to study the distribution of oxytocin on hypothalamus in dairy goat during midgestation.The oxytocin-immunohistochemical(OT-IR) neurons were mainly distributed over nucleus pareventricularis and nucleus supra-optious;in addition,OT-IR neurons were also found in nucleus circularis,nucleus supra-opticus diffuses,nucleus arcuatus,nucleus periventricularis,nucleus perifornicalis,area anterior hypothalami,area lateralis hypothalami,nucleus posterior hypothalami,nucleus mamilaris and so on.More OT-IR nerve fibers were observed in nucleus paraventricularis,nucleus supra-opticus diffuses,nucleus supra-optious,medium eminence and the surrounding area of the third ventricle and so on.Also,some nerve fibers were found in nucleus suprachiasmaricus.These results suggested that the distribution of OT in the hypothalamus of dairy goat during midgestation was extensive and the physiological effection was on target cells by blood circle after releasing by three channels which were the third ventriculus(cerebrospinal fluid)、neurohypophysis and blood vessel.