Sagittal Silver Section x= +3.0

X= +3.0

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The ellipsoid body is here shown lying immediately behind cross sections of the divisions of the mushroom body's medial lobe: g, b, and b'. The g division is possibly divided into two parallel components, g and g'. Not all regions of the brain are so well demarcated as these or the central complex neuropils. Thus, certain authors have referred to these other regions as "unstructured" or "diffuse" neuropils, for want of a better term. However, regions like the superior medial and inferior medial protocerebra (s m pr, i m pr) comprise quite well demarcated volumes or nuclei of synaptic neuropils, although the functional attributes of these are still unknown. These regions are also connected by tracts, such as the equatorial horizontal tract (eq h t) that extends from the upper front of the brain obliquely downwards and posteriorly, to the posterior slope neuropils and antennal mechanosensory neuropils. The latter is so named because it receives afferents from the antenna's scapus and pedicellus, both of which are equipped with mechanosensory sensilla.

This level also shows the two roots (superior, s; inferior, i) of the inner antennocerebral tract (i act) arising from the antennal lobe.

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