中腦短横斷による去脳硬直

On the decerebrate rigidity by partial transection of midbrain.

緒論

　去腦硬直に關する實驗生理學的研究はSherr-ingtonに始る。爾來この現象は骨骼筋緊張の問題を解く鍵としてMagnus^6），　Bazett　＆　Penfie—ld^3）　Rademaker^8），　Fulton^4）　Ingram＆Rans-on^5），　Bard, Brooks and Woolsey^2），　Bard^1）等によつて研究が續けられて來たが，未だこの現象の決定的な解明を行つた業績はない。

　中邑^7）は，犬を用いて皮質癲癇痙攣を研究するために中腦全域に亙つてこれを縦切する實驗を試みた際に，屡々去腦硬直に似た硬直が四肢に現われる現象を觀察した。

(1) The rigidity in the sense of Sherrington could be evoked by partial transection of mid-brain aftet the exposure of the central surface of brain stem and medulla by our new opera-tion technique.

(2) A partial transection for about 2.5mm at the midline of the midbrain was sufficient to ensure the decerebrate rigidity, and not ne-cessary to take a total transection.

(3) Unilateral section induced the rigidity of homolateral limbs.

(4) The inhibitory centre for the decerebra-te rigidity seem to be localized in the central grey matter above the transected level, being limited within 5-6mm in length, 2.5mm in width.