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Transection of the infraorbital nerve in adult rats results in an array of chronic functional anomalies in trigeminal brainstem subnucleus interpolaris, including changes in normal receptive field organization. This work examined whether long-term maintenance of acute modifications, such as unmasking or strengthening of normally ineffective inputs to(More)
1. The connection between inspiratory neurones in the ventrolateral nucleus tractus solitarius (n.t.s.) and intercostal motoneurones was examined. 2. Descending axonal projections to contralateral T3-T5 spinal segments were found for 110 of 142 (77%) ventrolateral n.t.s. neurones examined. 3. Antidromic mapping was used to locate the axons of thirty-nine(More)
These experiments examined possible inhibitory inputs to upper cervical inspiratory neurons from the expiratory neurons of the Botzinger complex. Eighty-one Botzinger neurons were tested with antidromic mapping for a projection to the C1 segment of the spinal cord; 44/81 (54%) were found to project, 27/79 (34%) contralaterally, 17/68 (25%) ipsilaterally,(More)
One of the hypotheses to account for the increase in the drive to ventilation in exercise mediated by the peripheral chemoreceptors is that there is an improved linkage between breathing rate and lung to carotid body circulation time, such that peaks of arterial carbon dioxide arrive during a subsequent inspiration thereby stimulating ventilation. This(More)
The ventrolateral region in the medulla of cats was explored with pairs of microelectrodes with tip separations from 100 to 300 micron such that extracellular potentials of pairs of near-neighboring neurons were recorded simultaneously. At least one neuron of each pair was antidromically activated from the spinal cord. Cross-correlation histograms were(More)
The medullary respiratory neurons involved in the generation of respiratory rhythm are reviewed. The subject is introduced by a brief description to the history of respiratory neurophysiology and of the pontine respiratory neurons. A detailed neurophysiological review is presented for the medullary respiratory neurons: their locations, morphology, firing(More)