Figure 1.

Frontal view of the face of a male Helicoverpa zea moth showing the two antennal lobes at the bases of the antennae. The preparation has been histologically cleared so that the many antennal lobe glomeruli are visible as spheroidal shapes. Asterisks denote 'ordinary' glomeruli that receive inputs from antennal neurons responding to general environmental odorants such as plant volatiles. The ordinary glomeruli reside in a large cluster in each antennal lobe (Ord). Larger glomeruli that receive inputs from pheromone component-tuned neurons on the antenna reside in their own cluster called the macroglomerular complex (MGC) and are labeled with an 'm'. Ant, the remaining bases of the antennae and antennal nerves; eye, optic lobe.