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  • Title: Motoneuronal location of the external urethral and anal sphincters: a single and double labeling study in the male and female golden hamster.
    Author: Gerrits PO, Sie JA, Holstege G.
    Journal: Neurosci Lett; 1997 May 02; 226(3):191-4. PubMed ID: 9175599.
    Abstract:
    The location of external urethral (EUS) and anal sphincter (EAS) motoneurons was investigated in the golden hamster using the retrograde tracers horseradish peroxidase and cholera toxin B-subunit. Single and double labeling studies revealed that the motoneurons of the EUS and EAS were present in the same nucleus (nucleus of Onuf) ventrolaterally in the ventral horn of the caudal first sacral segment and throughout the second sacral segment. Within Onuf's nucleus the EAS motoneurons were located dorsomedial to the EUS motoneurons, which were located at the border of the gray and white matter. This location is similar to that in cat, dog, monkey and man, but differs from that in rat, Mongolian gerbil and domestic pig.
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