G Gilberti Vitali

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In the research it has been tested the ability of convoluted capillary network of the fungiform papillae to act as countercurrent ionic exchanger and therefore to give rise a water uptake from the external environment. Manometric determinations of the water inflow during immersion of the tongue in solutions of different osmolality have shown a conspicuous(More)
The present research is intended to evaluate the frequency of the ciliary beat in different formations of the frog's oral cavity. The phenomenon has been quantitatively evaluated on the television images of mucus-ciliary waves by means of a photometric method, in order to obtain an electrical indication of the beat frequency. The results show that frequency(More)
It has been examined the influence of vanadium on the papillary osmotic water-salts uptake in order to differentiate it from water flow of other biological substrates as amphibia epithelia. Between the different vanadium compounds only the metavanadate is active and only after administration in the abdominal vein. The general influence of metavanadate is a(More)
The inhibitory influence exercised at the bulbar level by crossed afferent innervation of the lingual mechanoreceptors has been examined in the frog. To reach this aim it has been electrically stimulated the central stump of both glossopharyngeal and hypoglossal unilaterally axotomized nerves and recorded the crossed reflex effects in the controlateral(More)
This research concerns the modulation by lingual afferences of the reflex activity of frog XII nucleus. Some informations on the processes utilized to obtain this effect has been achieved by comparing the glossopharyngeal-hypoglossal reflex evoked bilaterally after excision of one hypoglossal nerve. The reflex response and electrotonic potential become more(More)
It has been recorded the extracellular field potentials of the frog's olfactory bulb produced by electrical stimulation of the commissura anterior and small branches of the olfactory nerve. The activation of the commissural system obtain a positive, long-lasting field potential generated at the soma of the granular cells. The olfactory nerve stimulation(More)
In the previous papers we have reported that the innervation of the frog lingual mucosa exercises a presynaptic inhibition at the bulbar region in order to integrate the mechanoreceptive information coming from the tongue. The present investigation was undertaken to establish if also the complementary tactile innervation of fungiform papillae has a similar(More)
In previous researches it has been demonstrated that the frog's tongue mechanoreceptors afferences exercise a presynaptic inhibition on the motor reflex activity evoked by themselves at the bulbar level. Since the indication on this effect were only indirectly obtained this present investigation is now devoted to obtain on the same subject also more direct(More)