A complete adult Drosophila melanogaster brain tracheolar network

A complete adult Drosophila melanogaster brain tracheolar map reconstructed 117 tracheoles with 1,376 endings, showing they branch in parenchyma without forming an interconnected network.

• Why it matters: Adult brain tracheolar organization is poorly characterized compared with embryonic and larval stages, limiting understanding of how oxygen delivery interfaces with neural structure and metabolism.
• What they did: Using manual tracing in the Full Adult Fly Brain (FAFB) electron microscopy dataset, the authors reconstructed 117 tracheoles and 1,376 endings, then integrated skeletons with FlyWire volumetric mesh segmentations.
• The result: Tracheole volume fraction varies across neuropils and is largely symmetric between hemispheres; synapses are not enriched near tracheoles and are slightly depleted within ~15 um, enabling future coupling studies of neural activity and metabolic demand to tracheolar development and function.

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