Figure 7.

A: Reconstruction of the FMRFamide-immunoreactive extrinsic neuron wrapping around the MD1 glomerulus at the dorsomedial portion of the AL. B: Maximum projection of 40 optical sections showing a frontal view of the FMRFamide-immunoreactive extrinsic neuron in the posterolateral region of the AL of a female Ae. aegypti. Note the loop-like thick varicose FMRFamide-immunoreactive fibers (arrow). C: Maximum projection of 40 optical sections showing the axon of the FMRFamide-immunoreactive extrinsic neuron, which bifurcates at the level of the central complex (CC) and extends one branch, which further bifurcates, into the superior protocerebrum (arrow), and a second branch into the base of the CC (arrow head). D: Maximum projection of 40 optical sections showing a bifurcated branch of the axon that extends into the superior protocerebrum where it further branches (arrow) (see also E). E: Frontal reconstruction of the FMRFamide-immunoreactive neurons in the brain of Ae. aegypti. Fifteen to 20 cell bodies of LN in the lateral cell cluster project primary neurites into the AL as one thick bundle that supplies immunoreactivity to the AL glomeruli. Intensely stained and clearly delineated medial glomeruli can be seen in the AL neuropil. A pair of FMRFamide-immunoreactive extrinsic neurons connects the AL neuropil with higher brain centers. Axons of these neurons exit the AL and run medially through the lateral accessory lobe (LAL) and bifurcate at the level of the CC. Here, one branch ascends further into the superior protocerebrum and a second branch extends medially to the base of the CC and arborizes densely in the core of the CC. A varicose fiber innervating the LAL and the ventral body of the CC is also seen (arrow). AMMC: antennal motor and mechanosensory center; OE: esophagus; AN: antennal nerve; SOG: subesophageal ganglion; OL: optic lobe. Scale bars = 25 μm.