Synaptic responses of medullary neurons to stimulation of the medullary "locomotor strip" by current of about 20 microA were recorded extracellularly in mesencephalic decerebellized cats. The mean latency of responses of 177 units was 3.2 ms. Synaptically driven units were located both in the lateral and in the medial reticular formation, however short-latent responses were observed predominantly in the lateral part. Single stimulus evoked discharge consisted of two or more spikes in 32% of units. Respiratory neurons were not activated by stimulation of the locomotor point. The data obtained show that neurons of the "locomotor strip" can excite both one another and neurons located more medially. Possible mechanisms of extending the activity to the upper cervical segments of the spinal cord are discussed.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Evidence for the existence of a functional polysynaptic pathway from trigeminal afferents to lumbar motoneurons in the neonatal rat.
Eur J Neurosci
January 1995
CNRS, NBM, Marseille, France.
Stimulation of trigeminal afferents has been reported to have powerful effects on the spinal cord in adult animals of several species. In the present study, the pathway transmitting these influences was investigated in the neonatal rat. Experiments were performed on in vitro brainstem/spinal cord preparations.
View Article and Find Full Text PDFRespiratory responses to stimulation of spinal or medullary locomotor structures in decerebrate cats.
Acta Neurobiol Exp (Wars)
August 1994
Department of Neurophysiology, Polish Academy of Sciences, Warsaw.
Respiratory and locomotor EMG activity was recorded in cats after a precollicular post-mamillary decerebration. Locomotion was induced by stimulating either the dorsolateral funiculus (DLF) in the cervical spinal cord or the medullary locomotor strip (MLS). At the onset of locomotion, both ventilation and blood pressure were enhanced.
View Article and Find Full Text PDFAvian locomotion activated by brainstem infusion of neurotransmitter agonists and antagonists. II. gamma-Aminobutyric acid.
Exp Brain Res
November 1991
Department of Zoology, University of British Columbia Vancouver, Canada.
The companion article (Sholomenko et al. 1991) described the brainstem locomoter regions in the bird where direct intracerebral injection of a number of putative excitatory neurochemicals, including cholinergic agonists, N-methyl-d-aspartate (NMDA) and Substance P, evoke locomotion. Using the same experimental protocol, this study focuses on the locomotor effects following discrete brainstem injections of the inhibitory neurotransmitter, gamma-aminobutyric acid (GABA), and some of GABA agonists and antagonists.
View Article and Find Full Text PDFStructure of spinal cord locomotor strip in the cat.
Acta Neurobiol Exp (Wars)
November 1990
Department of Physiology of the Spinal Cord, A. A. Bogomoletz Institute of Physiology, Academy of Sciences of Ukrainian SSR, Kiev.
The origin of spinal locomotor strip fibers was studied in the cat by means of electrical stimulation combined with horse-radish peroxidase transport technique. It was revealed that a corticospinal tract presumably formed the locomotor strip. Some reticulospinal and trigeminal tract fibers were also found.
View Article and Find Full Text PDF[Morphologic analysis of the origin of spinal locomotor strip fibers in the cat].
Neirofiziologiia
September 1989
The origin of spinal locomotor strip fibres was studied in cat by means of electrical stimulation combined with the horse-radish peroxidase transport technique. It was revealed that the cortico-spinal tract presumably formed the locomotor strip. Some reticulo-spinal and spinal trigeminal tracts fibres were also found.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!