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KMID : 0358419930360060826
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Korean Journal of Obstetrics and Gynecology
1993 Volume.36 No. 6 p.826 ~ p.836
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The Effects of the Uterine Pain on the Spinal Reflex in the Cat
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Abstract
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many parturients and patients who have uterine diseases develop the low back pain. Whether the spasmic contraction of the back muscles can be the cause of the low back pain is the subject of this study.
The changes of impulse discharge rate were recorded from the 32 single spinal motoneurons in the ventral roots of alpha-chloralose anesthetized cats.
We could find many spinal motoneurons both those supposed to be α-motoneurons and those supposed to be γ-motoneurons which increase the impulse discharge rate as the response to the algesic substance, bradykinin injected into the uterine
artery.
The response was largest at the L4 ventral root, and decreased gradually as the level was changed to L3 and L2 When the bradykinin was injected intravenously, the spinal motoneurons supposed to be γ-motoneurons increased impulse discharge rate.
But the
response was smaller than that to intra-arterially injected bradykinin.
These results suggest that the signal of uterine pain which is transmitted to the spinal cord by way of the hypogastric nerve activate the spinal motoneurons which elicits the contraction of the low back muscles. This mechanism may be one of the
explanations of the causes of the low back pain as the symptom of the patients at the clinics of obstetrics and gynecology.
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