Sagittal Silver Section x= +8.0

X= +8.0

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The mushroom body pedunculus (ped) extends forwards from the calyx, its posterior part being almost obscured by the swathe of protocerebral fibers (l m pr) that envelop it. A large efferent neuron axons (red arrow) lies within the base of the pedunculus and its swollen lateral component, called the spur. The swollen tips of the vertical lobe are indicated (a and a'). The pedunculus lies above the lateral neuropil of the ventral bodies (l v bo). Neuropil behind the great commissure receives large fibers from the posterior part of the tritocerebrum (p trito-deu fasc). There are two prominent tracts at the back of the brain: the posterior optic tract (p op t), carrying axons from the medulla; and the bundle of horizontal and vertical cell axons (hs/vs ax), which, more medially, divides such that vertical cell axons project parallel to the X-axis, whereas horizontal cell axons plunge ventrally along the posterior margin of the tritocerebrum to reach the posterior lateral margin of the mandibular neuromere.

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AA00139