Frontal Silver Section 21: y = -7.0

y= -7.0

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The buttress of the protocerebral bridge (bu pr.br) flank the incoming axons from the ocellus (ocl.n). At this level, the most prominent mid-brain structures are the calyces of the mushroom body (ca m.b) which are flanked by the upper part of the posterior lateral fascicle (p.l.fasc) and then, at the edge of the brain, the remnant of the lateral horn (l.ho). Note the loose arrangement of some axons from the lobula ascending towards this level. Their projection contrasts with most of the other lobula-derived bundles, the axons of which are tightly clustered.

The suboesophageal ganglion is shown with two heterolateral projections, the lower derived from bundles of terminals from receptor neurons that originate from sensilla on the head capsule.

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

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