Fig. 6. Activity descending from the head ganglion. A. Diagram of the experi mental preparation and set-up for recording activity descending from the head g anglion in the lateral connective. B. Approximately 2 sec before the onset of a spontaneous swim episode there is a large increase activity in the lateral c onnective. Note that this activity in the lateral connective stops abruptly pr ior to the end of the swim episode. C. The length of the ventral nerve cord p reparation was reduced by cutting the connective between segmental ganglion 1 \ nd 2. In this new preparation few descending units in the lateral connective ar e active before the onset of a spontaneous swim episode. Return to Results