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Spinocerebellar projections from thoracic segments in the cat studied by the anterograde WGA-HRP method
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13 Motor system III Cerebellum and brainstem SPINOCEREBELLAR PROJECTIONS FROM THORACIC SEGMENTS IN THE CAT STUDIED BY THK ANTEROGRADE WGA-HRP METHOD HIROYUKI YAGINUMA and MATSUO MATSUSHITA, Department of Anatomy, Institute of Basic Medical Sciences, University of Tsukuba, Niihari, Ibaraki 305, Japan. The projection fields of spinocerebellar tracts arising from thoracic segments were examined by the anterograde transport of wheat germ agglutinin bound to horseradish peroxidase (WGA-HRP) in the cat. Following injections of WGA-HRP into upper to middle thoracic segments, labeled mossy fiber terminals were seen in all lobules of the anterior lobe, lobules VI and VIII, sublobule VIIb, the paramedian lobule, and medial parts of the dorsal paraflocculus, crus I, crus II and the simple lobule. The number of labeled terminals in each lobule accounted for 61% of the total in sublobules IIb to vb, 8% in sublobules Vc to Vg, 5% in lobule VI, 6% in lobule VIII and 16% in the paramedian lobule. In sublobules IIb to Vb, labeled terminals were concentrated in the medial part (within about 1.0 to 1.5 mm lateral to the midline), forming two to three longitudinal bands in the middle part of the apicobasal extent of folia. These projections were bilateral, but exclusively ipsilateral in the paramedian lobule , the dorsal paraflocculus, crus I, crus II and the simple lobule. Similar findings were obtained following injections into lower thoracic segments. However, the labeled terminals were more numerous in the lateral part of the vermal region and in the intermediate region in lobules II to IV than in cases with injections into upper to middle thoracic segments. The present study demonstrates that one of the major neuronal groups in thoracic segments, Clarke's column, projects, in longitudinal bands, to the middle part of the medial vermal region (zone A) in sublobules IIb to Vb.
SPINOCEREBELLAR PROJECTIONS FROM CERVICAL SEGMENTS IN THE CAT STUDIED BY THE ANTEROGRADE WGA-HRP METHOD TOSHIO TANANI1, MICHIKO IKEDA2 and NATSUO NATSUSHITA1, 1Department of Anatomy, Institute of Basic Medical Sciences, University of Tsukuba, Niihari, Ibaraki 305 and 2Department of Anatomy, Kansai Medical School, Moriguchi, Osaka 570, Japan. The projection fields of spinocerebellar tracts arising from the central cervical nucleus and the cervical enlargement were studied by the anterograde transport of wheat germ agglutinin bound to horseradish peroxidase (WGA-HRP) in the cat. Following injections of WGA-HRP into the C1 to C4 segments, labeled terminals were seen in lobules I to IX, the paramedian and simple lobules, and crus I and crus II. These labeled terminals were concentrated in the medial part (within 2.0 mm lateral to the midline) and deep part of lobules I to IX. The number of labeled terminals in each lobule accounted for 40% of the total in sublobules Ib to IIb, 25% in lobules III and IV, 15% in lobule V, 5% in lobule VI and 12% in lobule VIII. Following injections of WGA-HRP into the C5 to C8 segments, labeled terminals were seen in sublobules Ib to VIc, VIIb and lobule VIII. They were distributed mainly in the medial part (within 2.0 mm lateral to the midline) and in the apical to middle parts of these lobules in their apicobasal extent. The number of labeled terminals in each lobule accounted for 18% of the total in lobules III and IV, 40% in lobule V and 40% in lobule VI. The present study demonstrates that the central cervical nucleus projects mainly to the deep part of the vermal region of the anterior lobe, and that neuronal groups in the cervical enlargement project to the apical to middle part of the vermis in caudal lobules of the anterior lobe and rostral lobules of the posterior lobe.
13 Motor system III Cerebellum and brainstem SPINOCEREBELLAR PROJECTIONS FROM THORACIC SEGMENTS IN THE CAT STUDIED BY THK ANTEROGRADE WGA-HRP METHOD HIROYUKI YAGINUMA and MATSUO MATSUSHITA, Department of Anatomy, Institute of Basic Medical Sciences, University of Tsukuba, Niihari, Ibaraki 305, Japan. The projection fields of spinocerebellar tracts arising from thoracic segments were examined by the anterograde transport of wheat germ agglutinin bound to horseradish peroxidase (WGA-HRP) in the cat. Following injections of WGA-HRP into upper to middle thoracic segments, labeled mossy fiber terminals were seen in all lobules of the anterior lobe, lobules VI and VIII, sublobule VIIb, the paramedian lobule, and medial parts of the dorsal paraflocculus, crus I, crus II and the simple lobule. The number of labeled terminals in each lobule accounted for 61% of the total in sublobules IIb to vb, 8% in sublobules Vc to Vg, 5% in lobule VI, 6% in lobule VIII and 16% in the paramedian lobule. In sublobules IIb to Vb, labeled terminals were concentrated in the medial part (within about 1.0 to 1.5 mm lateral to the midline), forming two to three longitudinal bands in the middle part of the apicobasal extent of folia. These projections were bilateral, but exclusively ipsilateral in the paramedian lobule , the dorsal paraflocculus, crus I, crus II and the simple lobule. Similar findings were obtained following injections into lower thoracic segments. However, the labeled terminals were more numerous in the lateral part of the vermal region and in the intermediate region in lobules II to IV than in cases with injections into upper to middle thoracic segments. The present study demonstrates that one of the major neuronal groups in thoracic segments, Clarke's column, projects, in longitudinal bands, to the middle part of the medial vermal region (zone A) in sublobules IIb to Vb.
SPINOCEREBELLAR PROJECTIONS FROM CERVICAL SEGMENTS IN THE CAT STUDIED BY THE ANTEROGRADE WGA-HRP METHOD TOSHIO TANANI1, MICHIKO IKEDA2 and NATSUO NATSUSHITA1, 1Department of Anatomy, Institute of Basic Medical Sciences, University of Tsukuba, Niihari, Ibaraki 305 and 2Department of Anatomy, Kansai Medical School, Moriguchi, Osaka 570, Japan. The projection fields of spinocerebellar tracts arising from the central cervical nucleus and the cervical enlargement were studied by the anterograde transport of wheat germ agglutinin bound to horseradish peroxidase (WGA-HRP) in the cat. Following injections of WGA-HRP into the C1 to C4 segments, labeled terminals were seen in lobules I to IX, the paramedian and simple lobules, and crus I and crus II. These labeled terminals were concentrated in the medial part (within 2.0 mm lateral to the midline) and deep part of lobules I to IX. The number of labeled terminals in each lobule accounted for 40% of the total in sublobules Ib to IIb, 25% in lobules III and IV, 15% in lobule V, 5% in lobule VI and 12% in lobule VIII. Following injections of WGA-HRP into the C5 to C8 segments, labeled terminals were seen in sublobules Ib to VIc, VIIb and lobule VIII. They were distributed mainly in the medial part (within 2.0 mm lateral to the midline) and in the apical to middle parts of these lobules in their apicobasal extent. The number of labeled terminals in each lobule accounted for 18% of the total in lobules III and IV, 40% in lobule V and 40% in lobule VI. The present study demonstrates that the central cervical nucleus projects mainly to the deep part of the vermal region of the anterior lobe, and that neuronal groups in the cervical enlargement project to the apical to middle part of the vermis in caudal lobules of the anterior lobe and rostral lobules of the posterior lobe.