Sagittal Silver Section x= +4.0

X= +4.0

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Four subdivisions of the mushroom bodies are visible at this level. The g division appears to be divided into two components, here labeled g and g'. The b and b'components lie behind these. Neuropil behind the antennal lobe, supplied by mechanosensory axons from the antennae, is termed the antennal mechanosensory region (ant m sense r). However, it also is connected by a broad fascicle of axons that reach towards the lower rear of the brain and lateral part of the suboesophageal "ganglion" (sog ant m sens t). It should be recalled that the suboesophageal ganglion is fused laterally to the supraoesophageal mass. These flanking neuropils are best ascribed to the tritocerebral neuromere, which is preoral. However, it is impossible to discern in the adult brain, which of the more ventral neuropils that flank the esophageal foramen belong to a postoral neuromere.

At this level, the inner antennocerebral tract (i act) is seen ascending just beneath the postero-lateral margin of the fan-shaped body. The tract carrying the giant interneurons (g inn) of the giant fiber system are also visible at this level.

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AA00135