Body Control Fly Behavior: New Connectome Reveals Local Circuits
- A connectome is a extensive map of neural connections within a nervous system.
- "The previous connectomes, which were wonderful and important, were kind of disembodied-they were large groups of cells connected with each other, but it was kind of a brain...
- Researchers have created a new connectome focusing on the nervous system of Drosophila melanogaster, the common fruit fly. This isn't the first connectome of a fruit fly nervous...
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New Connectome Maps Brain-body Connections in Fruit Flies, Offering Insights into Nervous System Control
What is a Connectome and Why Does it Matter?
A connectome is a extensive map of neural connections within a nervous system. Traditionally, connectomes have focused on the brain itself, detailing how neurons connect to each other. However,the nervous system doesn’t operate in isolation; it relies on input from and control over the rest of the body. This new research expands the concept of the connectome to include these crucial body connections.
“The previous connectomes, which were wonderful and important, were kind of disembodied-they were large groups of cells connected with each other, but it was kind of a brain in a vat,” explains Rachel Wilson, a professor of neurobiology at Harvard University. Understanding how the brain interacts with the body is essential for a complete picture of nervous system function.
The New Drosophila melanogaster Connectome
Researchers have created a new connectome focusing on the nervous system of Drosophila melanogaster, the common fruit fly. This isn’t the first connectome of a fruit fly nervous system, but it’s the first to comprehensively map connections *between* the brain and the body’s various organs and tissues.The team’s findings were initially published as a preprint on bioRxiv in July 2025 and the data is publicly available.
The study reveals that organs possess a surprising degree of autonomous control. They aren’t simply passive recipients of brain commands, but actively regulate themselves with only “gentle nudges” from the brain. This challenges the traditional view of a strictly top-down hierarchical nervous system.
Key Findings: Organs in Control
The research highlights that organs like the gut, heart, and muscles aren’t simply waiting for instructions from the brain. They possess intrinsic circuitry that allows them to function independently and respond to local stimuli. The brain modulates this activity, but doesn’t dictate it entirely.
“Organs are basically controlling themselves with some input and gentle nudges from longer-range signals,” notes Anita Devineni. This