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Investigations on the hypothalamo-neurohypophysial neurosecretory system of the grass frog (Rana pipiens) after transection of the proximal neurohypophysis - I. Light microscopic findings in animals kept at 18° C environmental temperature

Zeitschrift für Zellforschung und Mikroskopische Anatomie, ISSN: 0302-766X, Vol: 87, Issue: 1, Page: 1-16
1968
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After transection of the preoptico-neurohypophysial tract of the grass frog at the level of the proximal neurohypophysis, an increased amount of neurosecretory material is observed in the proximal and distal stumps. The proximal stump, after reaching a maximum evolution around the 5th postoperative day, continues to develop into a new posterior lobe. In the distal stump the maximum is reached at around the 2nd postoperative day and maintained until around the 5th day; the depletion of neurosecretory material of the posterior lobe begins after 2 days and is practically completed around 9 days after the transection. The increase in neurosecretory material in both the proximal and the distal stumps is attributed to a bidirectional axoplasmic flow as well as to a local axonal synthesis. © 1968 Springer-Verlag.

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