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Dendritic organization of the parabrachial nuclei: A Golgi study in the cat
$62 DENDRITIC ORGANIZATION OF THE PARABRACHIAL NUCLEI: A GOLGI STUDY IN THE CAT
YOSHIKI TAKEUCHI, HISASHI SAKAI AND RYOTARO MATSUSHIMA* Department of Anatomy, Faculty of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya 466, Japan and *Department of Oral Anatomy, School of Dentistry, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734, Japan.
The morphology of the parabrachial nuclei
(PBN) has been
studied, using a Golgi method, in the cat. The animals were anesthetized with sodium pentobarbital
(25 mg/kg i.p.).
The
identified small and medium-sized neurons principally showed a dendritic expansion confined to each subdivision of the PBN. However, in the medial and lateral subdivisions, some of these neurons were characterized by long dendrites extending to the brachium conjunctivum, locus c o e r u l e u s ~ or locus subcoeruleus. Especially, a very long dendrite of small-sized neurons was occasionally observed in the lateral subdivision, and ended in the medial subdivision through the brachium conjunctivum. ON AN ABERRANT FIBER BUNDLE OF HUMAN PONTINE LONGITUDINAL FASCICULI HISASHI SAKAI, Department of Anatomy, Faculty of Medicine, Nagoya University, 65 Tsurumai-cho, Showa-ku, Nagoya 466, Japan.
The aberrant bundle of the pontine longitudinal fasciculi was pursued in a human adult case of olivo-ponto-cerebellar atrophy. Every tenth section of transverse serial paraffin sections cut at 2Ollm were stained after Weigert's method; and another one after Novotny's double staining method. This aberrant fiber bundle which constitutes fibers which are myelinated more heavily than others, branches ventrally from the pons, descending as a small bundle ventrolateralwards through the layer of transverse pontine fibers, and goes out of the ventrolateral superficial part of the pons. After descending outside the pia mater for a short distance, it enters the brain stem again, descends, splits into a few small bundles along the ventrolateral part of the middle cerebellar peduncle and between the facial and the auditory nerves, goes through the deepest part of the ponto-cerebellar angle and then dorsalwards round the caudal limbus of the inferior cerbellar peduncle and into the dorsal part of the gracile nucleus from dorsolaterally on the same side, and disappears here. This bundle is an uncrossed aberrant part of the pontine longitudinal fasciculi and seems to be a part of the somatic corticosensoneuronal fibers of the pyramidal tracts.
YOSHIKI TAKEUCHI, HISASHI SAKAI AND RYOTARO MATSUSHIMA* Department of Anatomy, Faculty of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya 466, Japan and *Department of Oral Anatomy, School of Dentistry, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734, Japan.
The morphology of the parabrachial nuclei
(PBN) has been
studied, using a Golgi method, in the cat. The animals were anesthetized with sodium pentobarbital
(25 mg/kg i.p.).
The
identified small and medium-sized neurons principally showed a dendritic expansion confined to each subdivision of the PBN. However, in the medial and lateral subdivisions, some of these neurons were characterized by long dendrites extending to the brachium conjunctivum, locus c o e r u l e u s ~ or locus subcoeruleus. Especially, a very long dendrite of small-sized neurons was occasionally observed in the lateral subdivision, and ended in the medial subdivision through the brachium conjunctivum. ON AN ABERRANT FIBER BUNDLE OF HUMAN PONTINE LONGITUDINAL FASCICULI HISASHI SAKAI, Department of Anatomy, Faculty of Medicine, Nagoya University, 65 Tsurumai-cho, Showa-ku, Nagoya 466, Japan.
The aberrant bundle of the pontine longitudinal fasciculi was pursued in a human adult case of olivo-ponto-cerebellar atrophy. Every tenth section of transverse serial paraffin sections cut at 2Ollm were stained after Weigert's method; and another one after Novotny's double staining method. This aberrant fiber bundle which constitutes fibers which are myelinated more heavily than others, branches ventrally from the pons, descending as a small bundle ventrolateralwards through the layer of transverse pontine fibers, and goes out of the ventrolateral superficial part of the pons. After descending outside the pia mater for a short distance, it enters the brain stem again, descends, splits into a few small bundles along the ventrolateral part of the middle cerebellar peduncle and between the facial and the auditory nerves, goes through the deepest part of the ponto-cerebellar angle and then dorsalwards round the caudal limbus of the inferior cerbellar peduncle and into the dorsal part of the gracile nucleus from dorsolaterally on the same side, and disappears here. This bundle is an uncrossed aberrant part of the pontine longitudinal fasciculi and seems to be a part of the somatic corticosensoneuronal fibers of the pyramidal tracts.