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1. Motor nerve cells in the sacral cord: These are found in cornu ventrale. In the upper sacral cord, they may be divided into the lateral and medial groups, as in the lumbar cord, but the latter is poorly developed and disappears altogether in the lower sacral cord. The lateral group can be divided into the three subgroups of ventral, medial and dorsal, but the first is limited to the upper sacral cord in existence, being replaced by Onufrowitz's nucleus in the lower. This nucleus is not motor, but sympathetic in nature, histologically. The medial subgroup disappears in the lower sacral cord. On the contrary, the dorsal subgroup is well developed and reaches far down into the lowermost.<br> 2. Sensory nerve cells in the sacral cord: In zona spongiosa, much as in the lumbar cord, elongated sensory nerve cells are seen arranged in 1 or 2 rows. There are some sensory cells scattered in substantia gelatinosa, but the distinction between the dorsal and ventral groups is blurred in the lower sacral cord. No Clarke's nucleus was found existing. The sensory nerve cells in cornu dorsale are in sporadic existence as in the lumbar cord, but spherical cells were not found in the sacral cord. In formatio reticularis, a few vegetative cells and some rounded sensory cells were observed, the latter corresponding to Kuru's sensoryvegetative nerve cells.<br> 3. Vegetative nerve cells in the sacral cord: In the medial side of pars intermedia are found some parasympathetic nerve cells, though the division into the three groups, as in the lumbar cord, is here impracticable. Group of sympathetic and parasympathetic nerve cells, corresponding to the Bok's so-called nucleus cornu commissuralis anterioris, and better developed group of parasympathetic nerve cells corresponding to his nucleus cornu commissuralis posterioris were also observed. Suzuki's nucleus dorsalis canalis centralis was not found in the sacral cord.<br> The remarkably well-developed substantia gelatinosa and cornu dorsale in the sacral cord contain a large number of parasympathetic nerve cells. In the motor nerve cell groups in cornu ventrale also are found some sympathetic and parasympathetic nerve cells, though' in a number smaller than in the lumbar cord. We found a parasympathetic cell group in the place of Jacobsohn's nucleus sympathicus lateralis inferior, and a well developed cell group in the place of Jacobasohn's nucleus sympathicus mediosacralis, the latter being composed of a majority of parasympathetic and a minority of sympathetic cells. The grey matter in the lower sacral cord contains only vegetative, in particular parasympa-sympathetic cells, which composition continues down into, the coccygeal cord.
収録刊行物
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- The Tohoku Journal of Experimental Medicine
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The Tohoku Journal of Experimental Medicine 59 (3), 207-212, 1954
東北ジャーナル刊行会
