Fig. 10. Stretch receptor axons overlapping on the vertical dendritic branches of neuron #3. (A) The axon of TSR-4 (Fig. 1A) reaches the root of N3 belonging to TG4, and bifurcates into ascending and descending axons in the connective. The descending axon overlaps on one vertical dendritic branch of neuron #3 in TG5 (thin arrow). The opposite arrowhead indicates another vertical dendritic branch of neuron #3. The circle shows the location of a neuron #3 covered with melanophores. Bar, 500µm. (B) Another example in which the descending stretch receptor axon overlaps on the vertical dendritic branch of neuron #3 (thin arrow) opposite that in A. In this case, the TSR axon was descending at the root of N3 in TG3. The arrowhead indicates another vertical dendritic branch of neuron #3. Bar, 300µm. AXas, ascending axon of TSR; AXde, descending axon of TSR; N3, third segmental nerve; TG, thoracic ganlion.