Real MaleCNS research data

What can 166,700 neurons teach us about memory loss?

Scientists have mapped the complete brain and central nervous system of an adult male fruit fly. Explore the full spatial dataset, individual neuron morphology and strong modeled connections—then follow the careful path from a wiring diagram to useful Alzheimer’s research.

Explore the complete real model

166,700 neurons

125 million synapses

1 complete CNS brain + nerve cord

Concept infographic showing a luminous fruit fly brain with the optic lobes, mushroom body, central complex and antennal lobe labeled, followed by a map-to-research pathway and evidence limits — **A visual guide to the idea.** AI-generated concept artwork—not a scientific rendering of the MaleCNS dataset. The labels and summary are educational; use the linked primary sources and official data tools for research.

From map to medicine

A powerful hypothesis engine.
Not a tiny human brain.

The connectome can help researchers choose better experiments. It cannot by itself reproduce Alzheimer’s, predict a treatment or show how a living network changes over time.

01 · MAP

Trace circuits

Identify neurons and synapses involved in sensing, learning, recall and behavior.

02 · MODEL

Add biology

Introduce amyloid, tau or gene changes in selected cell types in living flies.

03 · TEST

Measure effects

Observe memory, neural function, lifespan and structural changes.

04 · VALIDATE

Check elsewhere

Retest promising mechanisms in human cells, organoids and mammalian models.

05 · TRANSLATE

Inform research

Use confirmed findings to sharpen human studies—not skip the required steps.

The question worth testing

Can a fly forget?

Fruit flies can learn, remember and lose learned associations. That makes them useful for asking focused questions about memory circuits—quickly, measurably and at a scale that is impossible in people.

What the connectome makes possible

Map a memory circuit.
Change one variable.
Measure what changes.

The result is a better experiment—not a shortcut from a fly brain to an Alzheimer’s cure.

Load the complete 166,700-neuron index Enter the Fly Care Room

Evidence and limits

What this can—and cannot—tell us.

What we know

The male connectome maps more than 166,000 neurons and about 125 million synaptic connections.
Fly and human nervous systems share many fundamental genes and cellular processes.
Flies support rapid genetic screens and measurable learning and memory experiments.
Connectomes can generate testable circuit-level hypotheses.

What we don’t know

A wiring diagram does not reveal the full electrical and chemical state of a living brain.
A fly model cannot reproduce the complexity of human Alzheimer’s disease.
Results in flies may fail in human cells, other animals or clinical studies.
The new map has not itself produced an Alzheimer’s treatment.

Editorial status: This page is a sourced educational explainer and has not been medically reviewed. It does not provide diagnosis, treatment advice or a claim that fruit-fly research will lead to a cure.

Read the research

Primary sources and further reading.

Sexual dimorphism in the complete connectome of the Drosophila male central nervous system Cell, 2026 · Primary connectome paper

Open paper ↗

Male CNS Connectome HHMI Janelia · Dataset, tools, documentation and CC BY license

Explore data ↗

A connectomics milestone: Mapping the complete male fruit fly brain Google Research · Plain-language project overview

Read overview ↗

Neuronal wiring diagram of an adult brain Nature, 2024 · Female fruit fly brain connectome