![]() Frequency response analysis revealed greater coherence for those pairs showing a spinocuneate interaction than for those with a cuneospinal interaction. These interactions occurred more often when the receptive fields of the two neurons were overlapping than when their fields were on adjacent digits. In 20 of these neuron pairs, the probability that the cuneate neuron would fire was greater after the PSDC neuron had fired (suggesting a spinocuneate interaction), five pairs showed an interaction in the opposite (cuneospinal) direction, and one pair had a significant inhibitory interaction. Cross-correlation analysis of the activity of 51 pairs of PSDC and cuneate neurons recorded simultaneously revealed a significant interaction in 26 pairs during spontaneous activity. The majority of both PSDC and cuneate neurons also responded to electrical stimulation of an adjacent digit, even though they did not respond to mechanical stimulation of that digit. PSDC and cuneate neurons had approximately the same mean latency to electrical stimulation of the receptive field, but PSDC neurons had significantly lower thresholds. The PSDC neurons had larger receptive fields than the cuneate neurons, but in both groups the fields never extended onto hairy skin. Proc Natl.Acad Sci U.S.The responses of 111 postsynaptic dorsal column (PSDC) neurons in the cervical spinal cord and 51 cuneate neurons with receptive fields on the glabrous skin of the forepaw were studied in anesthetized raccoons using extracellular recording techniques. (1999) A visceral pain pathway in the dorsal column of the spinal cord. Willis W D, Al Chaer E D, Quast M J et al. Wang CC, Willis WD, Westlund KN (1999) Ascending projections from the area around the spinal cord central canal: A Phaseolus vulgaris leucoagglutinin study in rats. Rustioni A (1973) Non-primary afferents to the nucleus gracilis from the lumbar cord of the cat. Petit D (1972) Postsynaptic fibres in the dorsal columns and their relay in the nucleus gracilis. Case report and review of the literature. (1997) Surgical interruption of a midline dorsal column visceral pain pathway. Kim YS, Kwon SJ (2000) High thoracic midline dorsal column myelotomy for severe visceral pain due to advanced stomach cancer. Honda CN, Lee CL (1985) Immunohistochemistry of synaptic input and functional characterizations of neurons near the spinal central canal. Honda CN (1985) Visceral and somatic afferent convergence onto neurons near the central canal in the sacral spinal cord of the cat. Hitchcock E (1970) Stereotactic cervical myelotomy. (1996) Is there a pathway in the posterior funiculus that signals visceral pain? Pain 67:291–305 Hirshberg RM, Al Chaer ED, Lawand NB et al. Gildenberg PL, Hirshberg RM (1984) Limited myelotomy for the treatment of intractable cancer pain. Evidence against an important role in nociception. Giesler GJ Jr, Cliffer KD (1985) Postsynaptic dorsal column pathway of the rat. Giesler GJ Jr, Nahin RL, Madsen AM (1984) Postsynaptic dorsal column pathway of the rat. ![]() (1983) Receptive field organization and response properties of spinal neurones with axons ascending the dorsal columns in the cat. J Neurophysiol 76:2675–2690īrown AG, Brown PB, Fyffe RE et al. ![]() (1996) Pelvic visceral input into the nucleus gracilis is largely mediated by the postsynaptic dorsal column pathway. Al-Chaer ED, Lawand NB, Westlund KN et al. ![]()
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