Topics in Neuroendocrinology, Vol. 38 by Author Unknown

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Extra resources for Topics in Neuroendocrinology, Vol. 38

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Scharrer had said this morning. In fact, weak stimuli, of 5 or 1 milliamp give also proportional release of both. So 1 don’t agree with the first part of y o u r comment. JAMIESON: I was just wondering whether a stimulus of 10 rnilliamp which I think is a powerful current for the tissue, may not give heat or electrolytic damage t o the tissue. What kind of stimulus are you using? DREIFUSS: We are using biphasic pulses, 2 millisecond biphasic pulses: in other words there are 2 rnilliseconds for each of the phases and we apply this pulse at 50 per second.

I . . . . . . . . . Fig. 1. 1 times threshold intensity (lower traces). Note the “all-or-none’’ character of the response. 5 niV. Rpferrnces n. 37 32 J. J. DREIFUSS et al. supraoptic and paraventricular nuclei, which give rise to the hypothalamo-neurohypophysial tract, are antidromically invaded by “all-or-none’’ action potentials elicited by electrical stimulation of the pituitary stalk (Fig. 1). , 1966; Dyball, 1971). Much progress in the understanding of neuroendocrine release mechanisms has been made after Douglas’ (1963) demonstration that the release of hormones from the nerve endings of the hypothalamo-neurohypophysial tract in the neurohypophysis can be readily studied in vitro in a preparation devoid of the parent cell bodies of the axons.

STOECKART:Petersen described axo-axonal contacts in the supraoptic nucleus in the rat. In his pictures one can clearly distinguish axo-axonal contacts around the axon hillock. S C H A D ~Axo-axonal : contacts in the nucleus itself can easily be included in the model of the generalized integrating neuron. The only problem we have regards the axo-axonal contact at the terminals of the axon of the integrating neuron, since the terminals are not involved in synaptic transmission, but in the release of a hormonal product.

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