Frontal Silver Section 11: y = -1.0

y= -1.0

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The ellipsoid body (e.b) is flanked by neuropil of the superior arch (s.ar) extending across the brain's midline, immediately under the pars intercerebralis (pars.in). This dorsal fissure contains most of the cell bodies of descending neurons that supply the median bundle. The pars intercerebralis also contains large cell bodies of neurosecretory cells destined for nerves targeting the retrocerebral complex (corpora cardiaca/allata). Other cell bodies in the pars belong to neuromodulatory neurons that supply areas of the brain, particularly the central body complex.

At this level, the antenno-glomerular tract has ascended to just beneath the lateral lower margin of the superior arch. The mechanosensory strand of the antennal nerve (mech. ant. n) begins to distribute its afferents into neuropil flanking the suboesophageal ganglion and adjacent to the ventro-lateral protocerebrum. The small bundle of fibres across the oesophagous link the left and right tritocerebral neuropils.

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

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