Horizontal Silver Section 13: z = -1.0

z = -1.0

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The great commissure (g. c) links the lateral protocerebra, extending across the oesophagous immediately below and behind the central body complex. The complex is here represented by the ellipsoid body (eb), and the lowermost flanges of the fan-shaped body (f. b). Dorsally (along the +x axis) at this level, the axons of giant vertical cells of the lobula plate (vs. ax) extend to the "posterior slope" neuropil where they terminate near the endings of the ocellar nerve (ocl. n), here seen in cross section. Ventrally on the neuraxis (anteriorly according to the body axis), the caudal branch of the anterior optic tract (cau. a. op. t) provides a stream of axons belonging to lobula columnar neurons, which terminate in the antero-medial optic tubercle (a-m op tu) lying immediately above the larger anterior optic tubercle shown in the next section. Another tract from the lobula (lo. t) extends towards the root of the g. com. This section also illustrates single axons of columnar neurons shared by the lobula and lobula plate (lo.lo.p).The mushroom body pedunculus here divides into the more caudal beta-lobe (mb. beta) situated behind a lobule of the frontal -lobe. The pedunculus also gives rise to a lateral specialization, the spur (mb. spr). The medially projecting gamma-beta-lobe complex is linked by axons of heterolateral efferent (output) neurons (-beta-het) the dendrites of which visit both mushroom bodies.

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

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