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Results for “functional connectivity”

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PubMedDate not supplied

[A statistical analysis of the functional connections between the neurons of the visual and motor cortex in different forms of conditioned-reflex behavior].

In experiments on cats with elaboration of delayed alimentary operant reflexes to light organization was studied of interneuronal cortical connections. By means of cross-correlation analysis the dynamics of intra- and interstructural neuronal network was revealed at the level of cortical projections (visual and motor) of cats brain zones at three forms of behaviour: CR realization, in intersignal period with the presence and absence of operant movements. Depending on the forms of behaviour, predominance of "informational" or "motivational" interneuronal connections was observed.

Animals↗
PubMed2006

Anatomical and functional connectivity of the transected ulnar nerve after accessory nerve neurotization in the cat.

AIM: The objective of this experimental study was to test the capacity of accessory nerve motoneurons to innervate muscles of the ulnar nerve territory after direct anastomosis. METHODS: This study used 22 cats in two groups: experimental group (15 cats) and control group (7 cats). The first one was followed during twelve months using electromyographic records every two months postsurgery; muscle and nerve histological assessment and counting horseradish peroxidase-labeled motoneurons. RESULTS: Our results showed that reinnervation was achieved in 12/15 nerves. The number of HRP labelled medullar motoneurons after anastomosis showed a significant statistic difference with a simple ulnar nerve transection; there was no significant statistic difference in labelling between the group with an anastomosis and the one with a simple accessory nerve transection. CONCLUSIONS: Direct anastomosis between the spinal accessory nerve and the ulnar nerve is achievable and thus, the accessory spinal nerve is another possible choice for correcting the motor deficit arising from lower brachial plexus avulsion, but the limited number of motoneurons would only allow partial reinnervation..

Accessory Nerve↗
PubMed1990

[The functional connection of rat habenular nucleus and lateral hypothalamic area in the regulation of cardiovascular activities].

The electrical stimulation of the lateral hypothalamic area (LH) in the rat elicited an obvious rise of the arterial pressure and increase in the heart rate. After the microinjection of lidocaine hydrochloride into the habenular nucleus (Hb) on the same side of the electrode, the vasopressor effect elicited by the electrical stimulation of the LH was blocked by 38.9% and the effect on heart rate was reduced by 44.4%. After the microinjection of lidocaine hydrochloride into the bilateral Hb, the vasopressor effect elicited by the electrical stimulation of the LH was blocked by 40.7% and the effect on heart rate was reduced by 41.2%. After the microinjection of the artificial cerebrospinal fluid into the unilateral or bilateral Hb, the cardiovascular effect elicited by the electrical stimulation of the LH was not affected. The electrical stimulation of the Hb in the rat elicited an obvious rise of the arterial pressure, but the heart rate was not changed significantly. After the microinjection of lidocaine hydrochloride into the LH on the same side of the electrode the vasopressor effect elicited by the electrical stimulation of the Hb was blocked by 63.2%. After the microinjection of lidocaine hydrochloride into the bilateral LH the vasopressor effect elicited by the electrical stimulation of Hb was blocked by 62.6%. After the microinjection of the artificial cerebrospinal fluid into the unilateral or bilateral LH, the cardiovascular effect elicited by the electrical stimulation of the Hb was not affected. The present study shows that the Hb and LH exert synergistic action in the regulation of the cardiovascular activities.

Animals↗
PubMedDate not supplied

[Structural-functional connections of the lemniscus system with the caudate nucleus in the cat].

Afferent projections were studied of nuclei of the spinal cord dorsal columns to the caudate nuclei. Evoked potentials (EPs) were recorded in the caudate nuclei and the nuclei of dorsal columns of the spinal cord to stimulation of the forelimb against the background and after unilateral elimination of the medial lemniscus. After the section, the EPs in the recorded nuclei sharply intensified in response to stimulation of the forelimb, ipsilateral to the section. Degenerative changes were also shown by electron microscopy in axonal terminals in the caudate nuclei at the operated side. Conclusion is drawn that the caudate nuclei receive direct connections from the contralateral nuclei of the spinal cord dorsal columns, which probably, conduct mainly kinesthetic afferent influences.

Afferent Pathways↗