Sagittal Silver Section x= +9.0

X= +9.0

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This level shows the whole length of the pedunculus from the calyx, which resides posteriorly and dorsally, to the front of the brain. In Drosophila the calyx, like other parts of the mushroom body, is greatly reduced and simplified compared to its homologue in honey bees and cockroaches (and, for that matter, in many other insects). Collaterals that arise from the inner antennocerebral tract supply the calyx. At this level, the tract has split into two components, a superior lateral and inferior lateral strand (s l str iact, il str i act). The first extends further laterally into the lateral horn of the superior lateral protocerebrum. Note that above the pedunculus the superior lateral protocerebrum is clearly demarcated into several discrete nuclei, as is neuropil under the pedunculus. This neuropil is confluent with neuropils of the deutocerebrum. Again, as has already been remarked, the distinctions of preoral neuromeres in the adult are almost impossible to make. However, bundles of axons from the optic lobes (here outlined in carmine) denote the approximate locations of deutocerebral regions. The posterior optic tract (p op t) is shown at this level just anterior to the converging bundles of axons from horizontal (hs ax) and vertical motion sensitive neurons (vs ax) of the lobula plate. Another lobula plate axon bundle (lo p bdl) extends into the lateral deutocerebrum.

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AA00140