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Labelled neurons in mesencephalon and medulla oblongata of newt after periocular injection of horseradish peroxidase.

The retrograde transport of HRP after periocular space injection was investigated in mesencephalon and medulla oblongata of newt brain. In the tegmentum the neurons of oculomotor and troclear nucleus are filled. In the optic tectum some filled cells of mesencephalic trigeminal nucleus were, for the first time, described. This suggest that these neurons are deputated to proprioceptive innervation of the extrinsic ocular muscles. In the medulla oblongata the labelled neurons were located in the ganglion of Gasser and in the sensitive column of the trigeminal area. Other labelled neurons were found in the abducent nucleus and in the visceromotor column of the facial nerve. The authors discuss the analogy between the trigeminal labelled neurons of the medulla oblongata with supratrigeminal nucleus of the mammals.