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Digitale Medien

Hypothalamic and cortical D-C potential changes induced by stimulation of the midbrain reticular formation (1966)

Hayward, J. N. ; Fairchild, M. D. ; Stuart, D. G.

Springer

Experimental brain research 1 (1966), S. 205-219

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ISSN: 1432-1106

Schlagwort(e): D-C Potentials ; Hypothalamus ; Cortex ; Midbrain

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary D-C potential changes were evoked in the sensorimotor cortex and the hypothalamus of unanesthetized cats with chronically implanted electrodes by repetitive stimulation of the mesencephalic reticular formation. Stimulation at 30 to 300 p/sec. frequencies induced negative d-c shifts which were quite abrupt in onset, starting after the second or third shock with a peak of negativity reached within the first 50 to 100 msec of the 1 second duration of stimulation. Typically these negative shifts were sustained for the duration of stimulation with a prolonged 1 to 1.5 second return to baseline after termination of stimulation. Such d-c shifts were relatively independent of the site of the reference electrode but highly dependent on the location of the “active” recording electrodes and the stimulating electrodes. Reasons have been advanced to suggest that these negative d-c shifts reflect summated neuronal discharge in the immediate environs of “active” recording electrodes in the cerebral cortex and hypothalamus. In contrast to the consistent, stimulus-locked negative d-c shifts, less consistent changes, usually positive in polarity, were observed to begin 2 to 3 seconds after termination of RF stimulation. These slower d-c changes were highly dependent on the site of the reference electrode and the physical state of tissue at the electrode tip and therefore far less directly related to neuronal events in cortical and hypothalamic tissue.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00234342

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Digitale Medien

Isotocinergic neurons in the goldfish hypothalamus: Physiological and morphological studies on chemically identified cells (1979)

Reaves, T. A. ; Hayward, J. N.

Springer

Cell & tissue research 202 (1979), S. 17-23

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ISSN: 1432-0878

Schlagwort(e): Isotocinergic neurons ; Immunocytochemistry ; Hypothalamus ; Intracellular recording ; Goldfish (Carassius)

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Summary Isotocinergic (IT) neurons show physiological and morphological characteristics that are similar to those of other preoptic neuroendocrine cells in the goldfish. Preoptic IT cells show resting membrane potentials of 20–55 mV, action potentials of up to 100mV, and physiological evidence of axonal branching. Dye-marked IT cells measure 14–56 μm, their dendrites projecting to the ependyma and into the hypothalamic neuropil, their multiple beaded axons projecting to the pituitary. Indirect immunofluorescence identifies these dyemarked cells as IT. By combining electrophysiological, dye-marking and immunocytochemical techniques we can now, for the first time, study single, antidromically-identified peptidergic neurons of a specific type in vertebrate and invertebrate species.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00239217

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