The aim of this trial is to investigate if dexmedetomidine prolongs the duration of an ulnar
nerve block. By using healthy volunteers the investigators can perform bilateral ulnar nerve
blocks and thereby control for a systemic effect to clarify if the effect is actually
peripheral or systemic. The investigators hypothesis is that dexmedetomidine as an adjunct to
a local anaesthetic prolongs the duration of a peripheral nerve block by a peripheral
mechanism.