Olfactory bulb

The olfactory bulb is connected to the receptor cells in the nasal cavity. It sends its input to the pyriform cortex at the bottom of the brain, before it goes to the hypothalamus and dorsal medial thalamus.

Accessory olfactory bulb
Receives input about pheromones from the vomeronasal organ. This is sent to the amygdala and hypothalamus.