| Abstract: | The neural systems secreting vasotocin and mesotocin has been characterized in the Duck brain with indirect immunofluorescent techniques, using specific antisera. In the anterior preoptic region and in supraoptic and paraventricular nuclei, neurons producing vasotocine and neurons producing mesotocine have been identified separately. Only vasotocinergic neurons were localized in ectomammillary tract. Vasotocin--and mesotocin--containing axons together enter the median eminence, some of them crossed the internal zone of the median eminence before ending in the posterior lobe of the pituitary, whereas other axons of both classes entered the external layer of the rostral median eminence, in close contact with the capillaries of the hypophysial portal system. |
