The aim of the methods course for students of the "MSc (Master in Neurosciences) study program" and the "IMPRS (International Max Planck Research School) Neurosciences" was to learn the intracellular reording of neuronal signals from identified nerve cells. The medical leech (Hirudo medicinalis) serves as a model organism, as its nerve cells are quite easy to record even for beginners due to their size and visibility. XLAB lecturer Dr. Michael Ferber regularly teaches this basic technique at the ENI.