Sagittal Silver Section x= +5.0

X= +5.0

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The mechanosensory strand of the antenna, carrying axons (including giant axons: g mech sens ax) from the scapus and pedicellus, penetrates the brain to target the antennal mechanosensory neuropil. The labial nerve, which is somewhat out of focus, enters the suboesophageal mass laterally. The lateral ellipsoid tract (l e t) is here represented by a pair of large profiles, lying side by side, carrying the axons of a pair of heterolateral giant interneurons (g inn) that link the left and right giant descending neurons.

Ventral body neuropil (v bo) consists of several concentric or striate subdivisions. As a rule, in Drosophila and other taxa, it receives lateral processes of descending neurons as well as many outputs from central complex efferent neurons. A schemata of this organization can be viewed from here.

The subdivisions of the mushroom body lie immediately above a small region called the inferior satellite neuropil (i st mb) of the mushroom body. This neuropil receives collaterals of efferents that leave the mushroom body for other protocerebral neuropils. The i st mb provides a wide fascicle of exceptional thin fibers that sweep over the back of the median lobe and supply the superior satellite neuropil of the mushroom bodies (s st mb). The inferior medial and superior medial protocerebra (i m pr, s m pr) are separated by a broad swathe of axons that contribute to the oblique protocerebral fascicle (o pr fasc).

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AA00136