Fig. 2. Procedure (A) for recording stretch-activated responses of TSR-1 and (B) for demonstrating intersegmental inhibition of TSR-2 by TSR-3. All the ganglia except the first (A) and the second and the third (B) thoracic ganglia were cut off. TSR-1 was activated by moving the head in a horizontal direction with forceps mounted on a small micromanipulator connected to a vibration device. Stretch-activated responses of TSRs were recorded en passant from N3. N3, nerve 3; TG1, first thoracic ganglion; TS2, second thoracic segment; TSRs, thoracic stretch receptors; VD, vibration device; SM, small micromanipulator.