Articles: pain.
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Nippon Sanka Fujinka Gakkai Zasshi · Jan 1980
[Clinical analysis of the pain pathways of labor (author's transl)].
Segmental epidural blocks by double catheters which were inserted in the thoracolumbar (Th12-L1) and lower lumbar region (L4-L5) were performed in eleven primiparas to investigate the correct pain pathways of labor and the sensory innervation of uterus. It is generally believed in Japan that the sensory nerves of the cervix of uterus enter the cord through the sacral segments (s2,3,4) and the uterine body through the thoracic segments (Th11, Th12). 5 ml dose of 0.5% bupivacaine (Marcaine) was used to the upper catheter (Th12-L1) during the first stage of labor. Segmental spread of analgesia was on average Th9.4-L1,6 and the duration was 1 hr 57 min +/- 34 min. ⋯ Th11. Th12. L1 segments and no relation to sacral nerves.
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Res Publ Assoc Res Nerv Ment Dis · Jan 1980
Neurophysiology of nociception and pain in the spinal cord.
Our experiments on the primate spinothalamic tract cells are consistent with the traditional view that the spinothalamic tract in primates is the main pathway responsible for pain sensation. However, we have no evidence concerning the possible role of other pathways, either in pain sensation or in the motivational-affective or reflex responses to painful stimuli. ⋯ Wide-dynamic-range cells can signal intensity, but they are not likely to provide good spatial resolution of stimuli. On the contrary, they are well suited to explain such phenomena as referred pain and pain radiation.