猫腹侧间脑至脊髓的直接投射

DIRECT PROJECTIONS FROM THE VENTRAL DIENCEPHALON TO THE SPINAL CORD IN THE CAT

用成年猫5只,在一侧脊髓灰质内注射HRP,其中注射于颈髓者3例,注射于腰髓者2例,在丘脑下部及其邻近地区发现有标记细胞。颈、腰髓注射后的标记情况无明显差别。两侧均有标记,同侧多于对侧。丘脑下部之室旁核标记细胞数量最多,后区及外侧区次之,背侧区及乳头体上核中有少量标记。Forel氏区中也有少量标记,丘脑底核及未定带内仅发现个别标记细胞。我们未能在背内侧核中见到标记细胞。乳头体上核中的标记未见有文献记载。

HRP was injected into the cervical(3 cases)or lumbar(2 cases)spinal cord unilaterally in 5 adult cats.Labeled cells were discovered in the hypoth alamus and nearby areas.There was no obvious difference in labeling between cervical and lumbar injection cases.Labeled cells were found bilaterally with ipsilateral preponderance.he paraventricular nucleus was most heavily labeled;the posterior and lateral hypothalamic areas were less.A few labeled cells were found in the dorsal hypothalamic area and the supramamillary nucleus.Forel’s area was also weakly labeled and occasional cells were found in the subthalamic nucleus and zona incerta.We were unable to find labeled cells in the dorsomedial nucleus.Labeling of the supramamillary nucleus,which was found in this sutdy,has not been mentioned in the literature available to us.