Frontal Silver Section 6: y = +2.4

y = +2.4

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The gamma lobe at this level lies superior to the beta lobe. The medial part of gamma is thrown into lobular swellings that are best seen in GAL4 lines of the mushroom body, or in Golgi impregnations of Kenyon cells. The root of the +Z-directed mushroom body alpha lobe can be seen, as well as the laterally extending heel of the mushroom body's pedunculus (h.ped). At this level, dendrites leading to the median bundle decussate within the inferior medial protocerebrum (i.m.pr). Superior to them in the s.m.pr, almost textureless neuropil represents the fine terminal processes of median bundle afferents which, because of their small diameters, cannot be individually resolved by the Bodian method. Lateral to this region lies the anterior optic tubercle (ant.op.tu) which is a discrete optic glomerulus containing terminals of a species of small field lobula columnar neuron and the convergent endings of a type of tangential neuron from the medulla. The ant. op. tu supplies dendrites of a species of heterolateral descending neurons the structure of which are best known from larger species of flies.

The ventral body (v.b) is a protocerebral neuropil lying inferior to the mushroom body's beta-gamma lobes. It is connected to the l. m. pr. via a loose bundle of axons and neuropil extending vertically behind the mushroom body lobes at X =+/-3 - 5. The ventral bodies have also been classified as part of the central body complex because they receive connections from the fan shaped body. However, their neuropil is heavily invaded by central dendritic branches from descending neurons. The ventro-lateral protocerebrum (v.l.pr) is currently given this single name although there is good evidence for its subdivision into several discrete neuropils.

NJ Strausfeld, I Vilinsky, and LC Hansen, ARLDN, Tucson

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