Abstract
It is well known that facilitation or inhibition in spinal reflex occured usually which shows the participation of wide region of the spinal cord in the single spinal reflx.
In this experiment, the upper parts of the spinal cord of Bufo ulgaris or Rana nigromaculata were disected, and the reflex discharges were tested at the ventral root of lower segment. It was elucidated that the reflex discharges were strengthened or weakened following disection of the spinal cord. The strength of facilitation or inhibition appeared in the reflex were changed occording to the position of disection in the spiel cord.
From these facts, it was concluded that interneurons which took part in the facilitation or inhibition, distributed in wide region in the entire spinal cord.
