Ivan Larderet, Pauline Mj Fritsch, Nanae Gendre, G Larisa Neagu-Maier, Richard D Fetter, Casey M Schneider-Mizell, James W Truman, Marta Zlatic, Albert Cardona, Simon G Sprecher
Author Information
Ivan Larderet: Department of Biology, University of Fribourg, Fribourg, Switzerland.
Pauline Mj Fritsch: Department of Biology, University of Fribourg, Fribourg, Switzerland.
Nanae Gendre: Department of Biology, University of Fribourg, Fribourg, Switzerland.
G Larisa Neagu-Maier: Department of Biology, University of Fribourg, Fribourg, Switzerland.
Richard D Fetter: Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States.
Casey M Schneider-Mizell: Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States. ORCID
James W Truman: Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States.
Marta Zlatic: Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States.
Albert Cardona: Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States. ORCID
Simon G Sprecher: Department of Biology, University of Fribourg, Fribourg, Switzerland. ORCID
Visual systems transduce, process and transmit light-dependent environmental cues. Computation of visual features depends on photoreceptor neuron types (PR) present, organization of the eye and wiring of the underlying neural circuit. Here, we describe the circuit architecture of the visual system of larvae by mapping the synaptic wiring diagram and neurotransmitters. By contacting different targets, the two larval PR-subtypes create two converging pathways potentially underlying the computation of ambient light intensity and temporal light changes already within this first visual processing center. Locally processed visual information then signals via dedicated projection interneurons to higher brain areas including the lateral horn and mushroom body. The stratified structure of the larval optic neuropil (LON) suggests common organizational principles with the adult fly and vertebrate visual systems. The complete synaptic wiring diagram of the LON paves the way to understanding how circuits with reduced numerical complexity control wide ranges of behaviors.