Neuronal mechanisms of spino-bulbo-spinal activity

Gokin, A. P.; Pavlásek, J; Duda, P

doi:10.1016/0306-4522(77)90096-3

Cited by 9 publications

(2 citation statements)

References 14 publications

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“…In the majority of cells tested, responses to contralateral visceral stimulation were reduced or abolished in the spinal state indicating that their contralateral inputs were mediated or reinforced by supraspinal structures (Gokin, Pavlasek & Duda, 1977;Tattersall et al 1986a). All these cells were located in laminae VII and VIII.…”

Section: Neurones With Bilateral Visceral Inputsmentioning

confidence: 94%

Bilateral inputs and supraspinal control of viscerosomatic neurones in the lower thoracic spinal cord of the cat.

Cerveró¹,

Lumb²

1988

The Journal of Physiology

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SUMMARY1. Single-unit activity has been recorded from eighty-three viscero-somatic neurones in the lower thoracic spinal cord (T9-T1 1) of chloralose-anaesthetized cats. These neurones were driven bv natural and/or electrical stimulation in their somatic receptive fields and gave excitatory responses to electrical stimulation of the ipsilateral splanchnic nerve. Contralateral visceral inputs were tested by electrical stimulation of the contralateral splanchnic nerve. Tonic and phasic descending influences were tested by reversible spinalization with cold block at T7 and by electrical stimulation in nucleus raphe magnus and the immediately adjacent reticular formation.2. Most viscero-somatic neurones (89%) gave an excitatory response to stimulation of the contralateral splanchnic nerve and were therefore considered to have bilateral visceral inputs. In this group of neurones three categories of cells were identified depending on whether their responses to ipsilateral splanchnic nerve stimulation were decreased (50 %), increased (42 %) or unchanged (8 %) in the spinal state. Only one cell with an exclusively ipsilateral visceral input was tested for the effects of reversible spinalization. Stimulation of contralateral splanchnic nerve failed to evoke activity in this cell in the spinal state.3. Sixty-four viscero-somatic neurones with bilateral visceral inputs and four neurones with exclusively ipsilateral visceral inputs were tested with electrical stimulation in nucleus raphe magnus and the adjacent reticular formation. Seventyeight per cent gave an initial excitatory response which was followed by a period of reduced responsiveness to stimulation of visceral and somatic afferents. Three of the four neurones with an exclusively ipsilateral visceral input had no excitatory drive from the brain stem but their responses to stimulation of visceral and somatic afferents were depressed.4. The majority (77 %) of neurones with bilateral inputs were located in laminae VII and VIII with the remainder in the dorsal horn, predominantly laminae I and V, whereas all but one of the neurones with an exclusively ipsilateral visceral input were located in the superficial dorsal horn, predominantly lamina I, and none in laminae VII and VIII.5. These results show that the majority of viscero-somatic neurones in the cat's

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Section: Neurones With Bilateral Visceral Inputsmentioning

confidence: 94%

Bilateral inputs and supraspinal control of viscerosomatic neurones in the lower thoracic spinal cord of the cat.

Cerveró¹,

Lumb²

1988

The Journal of Physiology

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“…An unselective depression of all types of activity by phenylephrine would be consistent with a small al-mediated direct input onto SCT neurones. Electrophysiological studies of peripheral inputs to dorsal horn neurones in the thoracic spinal cord of the cat have shown that cells receiving convergent inputs from somatic and visceral afferent fibres are located in laminae I and V of the dorsal horn (Pomeranz, Wall & Weber, 1968;Gokin, 1970;Cervero, 1983a, b). The possible absence of a direct visceral projection to lamina II (the substantia gelatinosa (SG)) is of considerable interest as the majority of afferent fibres from viscera are unmyelinated and the SG is generally thought to receive most of the central endings of unmyelinated afferent fibres.…”

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confidence: 99%

Proceedings of the Physiological Society, 16‐18 June 1983, Cambridge Meeting: Communications

1983

The Journal of Physiology

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Role of the reticular formation in motor control. Study of some intrareticular mechanisms and functional properties of the reticulospinal system

Pavlásek¹,

M²,

Strauss³

1985

Neurophysiology

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Neuronal mechanisms of spino-bulbo-spinal activity

Cited by 9 publications

References 14 publications

Bilateral inputs and supraspinal control of viscerosomatic neurones in the lower thoracic spinal cord of the cat.

Bilateral inputs and supraspinal control of viscerosomatic neurones in the lower thoracic spinal cord of the cat.

Proceedings of the Physiological Society, 16‐18 June 1983, Cambridge Meeting: Communications

Role of the reticular formation in motor control. Study of some intrareticular mechanisms and functional properties of the reticulospinal system

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