Electrophysiology of Supramedullary Neurons in Spheroides maculatus

Intimate study of the electrical activity of various types of excitable cells, which has become possible with the use of intracellular recording, has disclosed numerous degrees of complexity in the phenomena by which bioelectric activity is produced. Excluding the different varieties of electrically inexcitable electrogenesis (28), and limiting consideration only to the electrically excitable form, several previously unsuspected phenomena have been observed. Different portions of the cell membrane have different excitabilities Indeed, some parts of the cell may not respond to stimuli with spikes In the giant neurons of Aplysia or Helix small responses, "pseudo pointes" (53), may be recorded. In some varieties of cells, graded responses are produced either in the normal activity