ネコの脊髄から起こる長上行路について(構造学的研究,<特集>脳と神経の研究VII)

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  • ネコの脊髄から起こる長上行路について
  • ネコ ノ セキズイ カラ オコル チョウジョウ コウロ ニ ツイテ
  • Long Ascending Fiber Tracts from the Spinal Cord in the Cat
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18匹のネコを用い,その上部頸髄から下部延髄高におよび,半切ないし,三叉神経脊髄路核または外側頸核に限局的な傷を与え,これによって生じた脊髄または延髄からの長上行路の変性を,Nauta-Gygax染色標本で調べ,以下の所見を得た。1.脊髄視床路は,起始・経過および終止部を異にする外側脊髄視床路と内側脊髄視床路に大別される。2.外側脊髄視床路の変性は,外側頸核よりも,むしろ,三叉神経脊髄路下核の損傷で起こる。反対側の脳幹を上行し,脊髄視蓋路を放出したのち,視床の後腹側核に終止する。3.内側脊髄視床路は,第3ないし第4頸髄以下の灰白質から起こる。延髄・橋の網様体および中心灰白質に見出される変性線維群と関係がありそうに見えるが,脳幹中の経過はそれ程,明らかではない。本神経路は,背内側核にもっとも明らかに,ついで外側中心核に終止し,なお,少量のものが内側中心核および労中心核に至る。

Degeneration study of long-ascending fiber pathways from the spinal cord and the medulla oblongata in the cat was carried out on Nauta-Gygax preparations of eighteen mature cat brains. All brains were hemisected or injured partially at levels from the upper cervical segments to the lower part of the medulla oblongata with involvement of the trigeminal spinal and the lateral cervical nucleus. 1) The spino-thalamic fiber system is composed of two distinctly separated pathways which have different origins, courses and terminations; the lateral spino-thalamic and the medial spinothalamic tract. 2) The fiber degenerations in the lateral spino-thalamic tract are not always induced by the injury of the lateral cervical nucleus, but rather originate from that of the trigeminal spinal nucleus. This tract ascends at the lateral part of the brain stem of the contralateral side and terminates in the nucleus ventralis posterior, after distributing the collaterals to the tectum. 3) The medial spino-thalamic tract has its origin in the dorsal gray substance at the various levels of the spinal cord below the third cervical segment. It appears to have a certain relation with the degenerating fibers found in the reticular formation, extending through the medulla oblongata and pons, and in the central gray matter of the midbrain, but its precise course is not obvious. This tract distributes to some nuclei in the medial portion of the thalamus. Heavy pre-terminal degeneration was found mainly in the nucleus medialis dorsalis, then in the nucleus centralis lateralis. Some degenerating fibers also were apparent in the nucleus centralis medialis and nucleus paracentralis.

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