After injection of horseradish peroxidase solution into the lateral line nerves of a poeciliid fish the afferent fibres can be followed up to their termination fields in the medulla, lobus vestibulolateralis, corpus cerebelli and valvula cerebelli. Labelling of all fibres innervating individual neuromasts reveals a well-ordered branching pattern of afferents in the CNS and a projection to all termination areas.