Fig. 2. (A) Lucifer Yellow-filled putative accessory neurons and TSR axon in the fourth thoracic ganglion (TG4). Lucifer Yellow was applied to the cut end of the third segmental nerve of the third thoracic ganglion. Black fragments on the dorsal surface of the thoracic ganglion show melanophores. The dorsal side is up. Bar, 300µm. (B) Schematically depicted accessory neurons and TSR axon in TG5 based on backfilling with Lucifer Yellow. ANT, anterior; AXas, ascending axon of the receptor cell of the thoracic stretch receptor; #1-3, putative accessory neurons; TG, thoracic ganglion.