Neuroanatomical tract-tracing techniques that did go viral
![Neuroanatomical tract-tracing techniques that did go viral](https://usg.fei-software-center.com/backoffice/wp-content/uploads/2020/02/Neuroanatomical-tracing.png)
Neuroanatomical tracing methods remain fundamental for elucidating the complexity of brain circuits. During the past decades, the technical arsenal at our disposal has been greatly enriched, with a steady supply of fresh arrivals. This paper provides a landscape view of classical and modern tools for tract-tracing purposes. Focus is placed on methods that have gone viral, i.e., became most widespread used and fully reliable.