CONNECTIONS BETWEEN THE SPINAL GRAY AND THE DORSAL COLUMN NUCLEI (DCN). Ⅱ. THE SPINO-DCN PROJECTION AND ITS RELATION WITH THE DCN-SPINAL CELLS: A COMBINED ANTEROGRADE AND RETROGRADE HRP STUDY
- VernacularTitle:脊髓灰质与后索核的联系Ⅱ.脊髓-后索核投射及其与后索核-脊髓细胞的关系——辣根过氧化物酶顺、逆行法联合研究
- Author:
Gong JU
- Publication Type:Journal Article
- From:
Acta Anatomica Sinica
1954;0(02):-
- CountryChina
- Language:Chinese
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Abstract:
HRP was injected into the cervical or lumbar spinal cord in 8 adult cats. The anterogradely labeled terminal arborization and its relation with the retrogradely labeled cells in the DCN were studied.The non-primary afferent fibers were distributed diffusely in the DCN. Injection of HRP in one spinal segment, either cervical or lumbar, resulted in labeling of terminal branches throughout the rostrocaudal extent of the DCN. In C6 or C7 injection cases large amount of labeled terminal branches were found in the medial cuneate nucleus, chiefly in its extraclusteral regions, viz. in the rostral part and in the ventral area of the caudal two thirds of the nucleus. A small celled area at the dorsolateral brim of the middle part of the medial cuneate nucleus was found to approach and to be contiguous with the external cuneate nucleus at higher level. This area was likewise densely labeled. Labeled terminal branches were also found in the gracile nucleus in lesser amount.After L5 or L6 injections the labeled terminals were much less in amount than in cervical injection cases. They were distributed mainly in the gracile nucleus. In the lower part of the nucleus the labeled terminals were found in its dorsal, medial, and ventrar areas. In the upper part of the nucleus they projected diffusely. A slight degree of labeling was also found in the ventromedial angle of the medial cuneate nucleus.The areas of distribution of the labeled terminals and labeled cells overlapped but did not coincide with eachother. No or merely a few labeled terminals were found around some of the labeled cells, while other cells were located right in the center of heaviest terminal labeling with abundant terminal branches surrounding their somata and dendrites. This proved that the non-primary afferent fibers of the DCN might form monosynaptic feed-back loop with the DGN-spinal cells.
