Median Bundle

The median bundle consists of two large bundles of ascending axons that extend around the esophageal foramen, converge above the gut, and then project to the roof of the protocerebrum, where they provide an extensive system of terminals. The bundle contains axons from various sources: from the ventral ganglia; from the subesophageal ganglia; and from the tritocerebrum. The bundle also contains axons of neurons that originate in the protocerebrum from cell bodies in the pars intercerebralis, noted for its variety of neurosecretory and modulatory neurons. These median bundle neurons have dendrites that extend over the dorsal medial protocerebrum and axons that descend through the medial bundle to terminate in the tritocerebral ganglion, each side of the esophageal foramen. The median bundle is diagrammed in the sagittal, horizontal and frontal schematics.

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