embryonic/larval anterior ventromedial cerebrum [FBbt_00007725]

embryonic/larval anterior ventromedial cerebrum

ID: FBbt_00007725

The anterior part of the ventromedial cerebrum (BPM). It abuts the posterior ventromedial cerebrum (VMCp) at the coronal slice level of the Great Commissure, (GC, BLAv1, BLD5; Pereanu et al. 2010). Ventrally, the boundary with the tritocerebrum (centro-medial and dorsal compartments) is defined by a somewhat curved, more or less axial plane defined by the tracts loVL (Balp2/3; Hartenstein et al., 2015), loVM (Bamv1/2; Hartenstein et al., 2015) and the BAla3 tract (Kumar et al., 2009). Medially, an extension of the centro-medial tritocerebrum is separated from the VMCa by the loVM (BAmv1/2) fascicle and a glial septum (Pereanu et al., 2006); more posteriorly, this boundary continues as a discontinuity in synaptic density (e.g. as assayed using the presynaptic marker bruchpilot). Laterally, the VMCa borders the lateral accessory lobe (LAL), separated by a virtual sagittal plane intersecting the deCP (DALd; posteriorly) and loVM (Bamv1/2; anteriorly) (Pereanu et al., 2006). At a more posterior level, the Ventro Lateral Protocerebrum (VLP) flanks the VMCa laterally, with the boundary along that of the posterior lateral protocerebrum (PLP)-VMCp, i.e. a virtual sagittal plane intersecting the LEFp (CP1v; posteriorly) and the loVL (Balp2/3; anteriorly) fascicles. The medial clamp borders the VMCa dorso-laterally with a virtual axial plane intersecting the MEF (CM1/3/4, medially) and LEFp (CP1v, laterally) fascicles constituting the boundary (Hartenstein et al., 2015). The Crepine borders dorsally, the boundary extending along the DALv2/3 (Hartenstein et al., 2015), DALcl1 and BAmd1v lineage tracts and the commissural fascicle SuEC (DALcl1v; Hartenstein et al., 2015). The lower toe (medial appendix of larval mushroom body) is dorso-medial. A region of low synaptic density separates the VMCa from the primordial fan-shaped body.