The
olfactory tubercle (OT, tuberculum olfactorium) is a
multi-sensory processing center in the olfactory cortex that plays a role in reward behaviors. The OT is a composite structure that receives direct input from the
olfactory bulb and contains the morphological and histochemical characteristics of the
ventral pallidum and the
striatum of the forebrain. In addition, the OT contains tightly packed cell clusters known as the
Islands of Calleja, which consist of small
granule cells. Even though it is part of the olfactory cortex and receives direct input from the
olfactory bulb, it has not been shown to play a role in processing of odors.