Spinal evoked potentials by median nerve stimulation were recorded on the cervical dura over the dorsal column in adult cats. The basic wave form consisted of two negative potentials.
Alterations in these potentials produced by compression injury to the cervical cord and roots were described. The rusults were as follows.
1. The median nerve in a cat mainly arises from C7 and C8.
2. The compression injury to the cervical cord and roots elicits latency delay and positive potentials.
