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用猫10只,分别干其颈膨大或腰膨大的一侧全灰质或一侧后角内注射HRP,研究下脑干到脊髓颈、腰膨大的投射。我们发现下列核群有细胞发出纤维投射到脊髓: 1.网状结构:巨细胞核、延髓中央核腹侧亚核、脑桥尾侧网状核和头侧网状核有较多脊髓投射细胞。延髓中央核背侧亚核、小细胞网状核、外侧旁巨细胞核、旁正中网状核腹侧亚核及中脑楔形核也向脊髓发出少量投射。除延髓中央核和小细胞网状核主要投至后角外, 其余核主要投射到后角以前灰质。 2.中缝核:大中缝核、苍白中缝核、隐中缝核向颈、腰膨大发出投射。背侧中缝核仅投射到颈膨大后角以前灰质。 3.薄束核及楔束核:向同侧颈、腰膨大发出部分重叠的定位投射。 4.脑神经核:E-W核、动眼神经主核、三叉神经脊束核、孤束核及前庭内侧核、外侧核、脊核和上核,前庭核ι细胞群均有细胞向脊髓发出投射。在前庭外侧核内,标记细胞有体部定位排列。 5.蓝斑、蓝斑下核、旁结合臂外侧核及内侧核、Kolliker-Fuse核、疑后核;投射至两侧脊髓。 6.红核:大量标记细胞出现在对侧红核内。红核的腹外侧部细胞投射至腰膨大,背内侧部投射到颈膨大。 7.上丘及中脑水管旁灰质投射到颈膨大后角以前的灰质。
10 cats were used to dry their neck or enlargement of the lumbar enlargement of the side of the whole side of the gray matter or the injection of HRP, study the brainstem to the spinal cord, lumbar enlargement of the projection. We found that the following nuclear populations have cells that project fibers to the spinal cord: 1. Reticular structures: Giant nucleus, ventral subnucleus medulla oblongata nucleus, caudal patellar nucleus retroflexus, and head-side reticular nucleus. The medulla oblongata nucleus dorsal subnucleus, small cell reticular nucleus, lateral paranuclear giant cell nucleus, paraxial reticular nucleus ventral subnucleus and midbrain wedge nucleus also send a small amount of projection to the spinal cord. In addition to the medulla oblongata central nucleus and small cell reticular nucleus mainly cast at the posterior horn, the other nucleus mainly projected to the posterior horn before the gray matter. 2. Suture nucleus: large and medium raphe nucleus, pale raphe nucleus, hidden in the nucleus to the neck, lumbar enlargement projection. The dorsal raphe nucleus projects only gray matter before the dilation angle of the neck. 3 thin beam nucleus and wedge beam nuclear: to the ipsilateral neck, lumbar enlargement issued partial overlap positioning projection. 4. Cerebral nerve nucleus: EW nucleus, oculomotor nerve main nucleus, trigeminal nerve nucleus, nucleus tractus solitarius and vestibular medial nucleus, lateral nucleus, spinal nucleus and nucleus, vestibular nuclear cell population of cells are issued to the spinal cord projection . In the lateral vestibular nucleus, the labeled cells have body alignment. 5. Locus coeruleus, locus coeruleus, lateral and medial nuclei of para-arm, Kolliker-Fuse nucleus, suspected nucleus; project to the spinal cord on both sides. 6. Red nucleus: a large number of labeled cells appear in the contralateral red nucleus. The ventral lateral cells of the red nucleus project to the lumbar enlargement, and the medial dorsal part projects to the neck. 7. The gray matter of the upper and middle cerebral vessels casts to the gray matter of the anterior horn of the neck.