[Oxytocinergic exohypothalamic connections to the medulla oblongata in the pigeon and rat].
The neurosecretory hypothalamo-hindbrain connection of lower vertebrates is also present in the pigeon and the rat. By means of the immunohistochemical technique and the pseudoisocyanine technique these fibres could be seen following known pathways through the mesencephalic reticular formation to the hindbrain. Here the fibres enter the region of the dorsal columns nuclei. The neurophysine vesicles demonstrable electronmicroscopically in these fibres are identical with the well known neurophysine vesicles which are present in the neurohypophysis of the investigated species. The content of the vesicles is indeed neurophysine as proved with the method by NAUMANN and STERBA [1]. The terminals of the fibres form neuro-neuronal synapses.
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