FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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Term supraesophageal commissural pioneer tract ID (Ontology) FBbt:00001632 (Fly Anatomy)
Definition Pioneer commissural tract of the embryonic supraesophageal ganglion. It is formed by the continuing axons of the medial cervical, lateral cervical and lateral protocerebral pioneer tracts that form three fascicles. First axons of the medial cervical tract (P2l and D/T clusters) grow medially towards the P2m cluster. Following the outline of this cluster, the axons reach the dorsal midline where they meet and fasciculate with their contralateral counterparts, and form the anterior ventral commissural tract (anterior VCT). A second commissural tract, the posterior VCT, is formed just posterior to the anterior VCT by collaterals of the lateral cervical tract. The third tract, the dorsal commissural tract, is formed by axons of the P4l and P3l clusters that grow anteriorly, make a sharp turn medially and form a commissural bundle dorsally to the anterior VCT.[ FlyBase:FBrf0105282 ]
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VFB:FBbt_00001632
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 supraesophageal commissural pioneer tract (all annotations which use CV term, excluding "NOT" statements)       1
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embryonic fiber tract
 |__supraesophageal embryonic fiber tract__
tract                                      |
 |__commissure_____________________________|
                                           supraesophageal commissural pioneer tract  1 rec.
                                            |__anterior ventral commissural pioneer tract
                                            |__central anastomosing tract
                                            |__posterior ventral commissural pioneer tract
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Is a supraesophageal embryonic fiber tract
commissure
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VFB:FBbt_00001632