Horizontal Silver Section 14: z = 0.0

z = 0.0

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Here, the anterior optic tract (a. op. t) can be followed from the base of the lobula into the prominent anterior optic tubercle (a. op. tu; alternate term: anterior optic focus) from which arise large dendritic branches of descending neurons (dn. a. op. tu) which later join heterolateral branches that receive inputs from lobula plate small field efferents. Note the divided appearance of the lateral neuropils into 4 lobes (1-4), each a target of a species of lobula small field efferent. Dorsal on the neuraxis, the posterior optic foci (p. op. fo) are supplied by axons of columnar efferents shared by the lobula plate and lobula (lop and lo neurons). The fan shaped body (f. b) is flanked by the lateral triangles of the central body complex. At this level, the ventral body (v. b) lies directly beneath the ellipsoid body (e. b). The -lobes (mb. ) are shown at their origin at the pedunculus-beta-lobe junctions.

The passage of fibres through the ellipsoid body indicated the zero level of the z axis. The fan-shaped body is shown supplied by fibers arising dorsally from the inferior medial protocerebrum. The cross sections of the antennoglomerular tracts (ant. gl. t) are visible just above the fb. The mushroom body (outlined to the right) is represented by the base of its -lobe and the inner most swelling of its -lobe.

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

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