Horizontal Silver Section 15: z = +2.0
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z = +2.0
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The two halves of the fan-shaped body (f. b) reveal their subdivisions into staves, each stave being denoted by an ensemble of small elements. The -lobes flank the superior medial protocerebral lobes (s. m. pr). The superior lateral protocerebrum (s. l. pr) is divided into many discrete regions, each with its distinctive architecture. The cellular identities of these regions, and their relationships with other brain areas are still unknown. Two commissures can be seen behind (dorsal top, on neuraxis) the central body: the inferior commissure of the protocerebral bridge (inf. c. pr. br) and the posterior optic tract (p. op. t). Two prominent fascicles running dorsad (the horizontal fascicles of the protocerebral bridge; h. fasc. pr. br) will reach the buttresses of the bridge at level y = -6.00. At this level, the antenno-glomerular tract has divided into an inner and outer component (o. ant. gl. t), the latter beginning to curve laterally to eventually disperse axons of olfactory projection neurons into protocerebrum beneath the calyces. The main strand of the ant. g. t. (here labeled i. ant. gl. t) remains close to the central body and will project anteriorly (along the z axis) to eventually curve laterally at level z = +4.00 and y = - 6.00. The posterior lateral fascicles (p. l. fasc) are condensed at this level as they project anteriorly towards the lateral horn.
NJ Strausfeld,, I Vilinsky, and LC Hansen, ARLDN, Tucson
|Flybrain Atlas Silver Sections Horizontal Silver Sections Horizontal Section z=+2.0|
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AC00090Page last modified: July 25, 2000 by Managers.