犬に於ける窒息痙攣の機制に就て

On the Mechanism of the Asphyxial Convulsions in a Dog

I．緒論

　松丸，名和，濱田^4）は大黒鼠及び家兎を用い，松丸，佐藤^5）は犬を用いて人工的に氣管閉塞，又はKCNの皮下或は静脈内注射によつて起る急性窒息の場合に起こる運動現象は，交代性痙攣と伸筋硬直より成立することを觀察した。後者を強縮性痙攣とするならば，この際の運動現象は交代性痙攣と強縮性痙攣のみなることを確認した。何れにしても間代性痙攣を生じないことが特徴であると云える。

　著者は更に犬を用いて，この場合に現われる運動現象の機制に就て研究することにした。

By the acute asphyxia due to tracheal closu-er or potassium cyanide injection, the alterna-tive convulsion of four limbs, and then the tonic one were evoked. This alternative convul-sion did not disappear after the removal of cerebral motor area or transection above the midbrain, but it vanished by the transection under the inferior colliculi.

On the other hand, tonic convulsion survived after the removal of cerebral motor area, of midbrain, and of medulla. Through these ob-servations, the auther reached to the conclu-sions as follows,

(1) The alternative convulsion due to asphy-xia would be induced due to the activity of the locomotive center of midbrain.

(2) The tonic convulsion would be evoked from the anterior horn cells of spinal cord.