Jean Cardinal does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

\item \textbf{Neurone en biologie.} Entre 1840 et 1900 on découvre que la cellule est l'élément fondamental du vivant ; par observation, Santiago Ram\'on y Cajal et d'autres mettent en évidence que ...