Frontal Silver Section 12: y = -2.0

y= -2.0

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The central body complex here comprises three neuropils: the paired noduli (no) beneath the fan-shaped body (f.b) which lies beneath the superior arch. As its name suggests, the fan-shaped body is characterized by a stave-like arrangements of large processes. These belong to large fan -shaped terminals and dendrites of neurons connecting this region to other brain areas. Also, each stave of the fan receives elements from bundles of axons that can be traced through this series dorsally along -Z to their origin in the protocerebral bridge. Bridge-fan-shaped body projection neurons also extend into the ellipsoid body with some terminating in the noduli.

At this level, the antennal nerve supplies mechansosensory neuropil of the dorso-lateral deutocerebrum. This "displaces" the ventrolateral protocerebrum laterally, and moving through the series along -Z axis, the observer will see that the mechanosensory neuropil gradually merges with the dorsal deutocerebrum's visual neuropil receiving outputs from the optic lobes. Here, mechanosensory neuropil provides bundles of axons that ascend at X +/-5, Z= -6 obliquely towards the midline.

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

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