Diversity of inhibitory circuit plasticity in the adult brain. A schematic of the types of structural rearrangements in inhibitory circuits observed in vivo (dynamic events are indicated in red).This includes (A) dendritic arbor, (B) dendritic spines, (C) axonal boutons, (D) axonal arbors, (E) inhibitory dendritic shaft synapses, and (f) inhibitory dendritic spine synapses.Axonal bouton and dendritic spine rearrangements in excitatory pyramidal neurons are also indicated.