The beginning of the 21st century has seen a renaissance in light microscopy and anatomical tract tracing that together are rapidly advancing our understanding of the form and function of neuronal circuits. The introduction of instruments for automated imaging of whole mouse brains, new cell type-specific and transsynaptic tracers, and computational methods for handling the whole-brain datasets has opened the door to neuroanatomical studies at an unprecedented scale. We present an overview of the state of play and future opportunities in charting long-range and local connectivity in the entire mouse brain and in linking brain circuits to function.
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