Larvae of the fruit fly Drosophila (foreground) (IMAGE)

University of Bonn

Larvae of the fruit fly Drosophila (foreground)

Caption

have a kind of stretch sensor in the esophagus (grey structure in the middle). It reports swallowing processes to the brain. If food is ingested, special neurons of the enteric nervous system (red) release serotonin. 

Credit

Image: Dr. Anton Miroschnikow/University of Bonn

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