This article describes three nervous system preparations using leeches: intracellular recording from neurons in ventral ganglia, culturing neurons from ventral ganglia, and recording from a patch of innervated skin to map sensory fields.
Titlow, J., Majeed, Z. R., Nicholls, J. G., Cooper, R. L. Intracellular Recording, Sensory Field Mapping, and Culturing Identified Neurons in the Leech, Hirudo medicinalis. J. Vis. Exp. (81), e50631, doi:10.3791/50631 (2013).