Figure 4.

Anatomy of the antennal lobe in the three honeybee castes. Anatomical staining (4% neutral red) of the left antennal lobes of a worker (left), a queen (middle) and a drone (right). The lobes are shown in frontal view, in the position in which they can be accessed during calcium imaging recordings. About 1/4 of the antennal lobe is thus accessible (30–40 glomeruli in workers). AN: antennal nerve; MG: macroglomerulus; v: ventral; l: lateral; m: medial; d: dorsal. Numbers in workers refer to identified glomeruli of the T1 ORN tract.