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Figure 9


Fig. 9. A model of effects of light on eclosion. EH activates both an eclosion activation pathway and a set of inhibitory neurons that repress eclosion behavior. The activation pathway may include the CCAP neurons and additional EH-downstream neurons. We postulate that the release of CCAP and other eclosion activators is inhibited by EH action. Light suppresses the inhibitory pathway to allow the release of CCAP and other factors and permit subsequent eclosion. In addition, light acts on the EH cells to stimulate EH release, probably via the retinal photoreceptors. Although eclosion can be accelerated by light, wing spreading cannot, suggesting that EH stimulates these behaviors via distinct pathways. Arrow and line thickness indicate the strengths of the different responses.





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