Frontal Silver Section 9: y = +1.0

y=+1.0

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The suboesophageal ganglion is represented by two neuropils: a striate sensory neuropil receives terminals from the mandibular nerve. Above it, a pear-shaped neuropil is partly supplied by branches from the median bundle. Flanking these tracts are the most dorsal (with respect to the neuraxis) glomeruli of the antennal lobes. They are connected heterolaterally by the interglomerular tract. This is a bundle of axons of interneurons linking the two antennal lobes. Immediately above this, at level Z=-3, runs the ventral commissure of the ventral bodies (v.com.v.bo) on which "rest" the remaining neuropil of the swollen tip of the beta lobe. The tracts converging towards the mid line, immediately above the beta lobe, comprise axons of neurons that arise in, or project to, the ring-shaped ellipsoid body, first visible at level Y=0. A loose arch of heterolateral axons above separates them from the last axons that collect medially to supply the medial bundle. The alpha lobes' caps (alpha cap) are visible at this level. They consist of discrete lobes that are better resolved in Golgi preparations of this neuropil or in GAL4 lines. The bundle of axons visible lateral to the mushroom body's pedunculus (ped) and extending towards the ventral body neuropil and inferior medial protocerebral neuropil above and beneath the pedunculus, belong to projection neurons from the medulla and lobula and supply the anterior optic tract leading to the anterior optic tubercle or "focus."

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

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