In the scholarpedia page on interneurons I encountered the following passage:
The perisomatic domain is responsible for the summation of postsynaptic potentials arriving from all dendritic branches [...]. Thus, the perisomatic region - and particularly the axon initial segment [...] plays a crucial role in the generation of output.
The page, however, does not define what the perisomatic region really is. What comprises the perisomatic region of an interneuron?