Table 1.

Secondary lineages of the larval brains and their axonal trajectories

LineageNumber of BranchesTract vortexAdult termTract transverseAdult termTract longitudinalAdult termTract verticalAdult term
DAMv11DAC1anterodorsal commissure
DAMv21DAC1anterodorsal commissure
DAMd11DAC1anterodorsal commissure
DAMd21loDMdorsal-horizontal tract
DAMd31loDMdorsal-horizontal tract
DALv11crMBpvl
DALv22crMBmlvVAC3/4inferior ventral body commissure
crMBmlvmedian fascicletrCM/DPC1central complex primordium
DALv32crMBmlvVAC3/4inferior ventral body commissure
crMBmlvmedian fascicletrCM/DPC1central complex primordium
DALcl12crMBppVAC3/4inferior ventral body commissureCAPTsubesophageal ventrolateral tract
DALcl22crMBppVAC3/4inferior ventral body commissureCAPTsubesophageal ventrolateral tract
DALl11crMBpvl
DALcm12crMBppDAC2frontal medial commissureCAPTsubesophageal ventrolateral tract
DALcm22crMBppDAC2frontal medial commissureCAPTsubesophageal ventrolateral tract
DALd11crMBppCAPTsubesophageal ventrolateral tract
BAmd12VAC2antennal commissure
DAC2frontal medial commissure
BAmd21VAC2antennal commissure
BAmv11loBM
BAmv21loBM
BAmv31ACTantenno-cerebral tract
BAmas11DAC1anterodorsal commissureMeBdmedian bundle
BAmas21DAC1anterodorsal commissureMeBdmedian bundle
BAla11crANroot 1 ACTACTantenno-cerebral tract
BAla21crANroot 1 ACTACTantenno cerebral tract
BAla31crANroot 1 ACTACTantenno-cerebral tract
BAla41crANroot 1 ACTACTantenno-cerebral tract
BAlc12crANroot 2 ACTACTantenno-cerebral tract
BAlc22crANroot 2 ACTACTantenno-cerebral tract
BAlp11balpm
BAlp22balppveBCroot 3 ACT
BAlp32balppveBCroot 3 ACT
BAlv1crAN
CM12loBM?
loCposterior tract ventral body
CM23VPC3?loBM?
VAC3/4subellipsoid body commissureloCposterior tract ventral body
CM32.VAC3/4subellipsoid body commissureloCposterior tract ventral body
trCM/DPC1central complex primordium
CM41VAC3/4subellipsoid body commissureloCposterior tract ventral body
CM51VAC3/4subellipsoid body commissureloCposterior tract ventral body
TRdm1trdm
TRdl1trdl
TRvm1trvm
TRvl1trvl
Trco1trco
DPMpl11loDMdorsal-horizontal tract
DPMpl21loDMdorsal-horizontal tract
DPMpl31loDMdorsal-horizontal tract
DPMpl41loDMdorsal-horizontal tract
DPMpm12DPC2lateral horn commissureloDMdorsal-horizontal tract
DPMpm22DPC2lateral horn commissureloDMdorsal-horizontal tract
DPMm13DPC2lateral horn commissureMCT
DPC1/VPC3central complex primordium
DPMm23DPC2lateral horn commissureMCT
DPC1/VPC3central complex primordium
DPMm32DPC2lateral horn commissure
DPC1/VPC3central complex primordium
DPMl11DPPT/veBL
DPMl21
DPMl31DPC2lateral horn commissure
DPMl41DPC2lateral horn commissure
DPLam2trCMcentral complex primordium
>DPC1dsuperior arch commissure
DPLal13crMBlDAC1anterior dorsal commissurelateral dorsal horizontal tract
trCMcentral complex primordium
DPLal23crMBlDAC1anterior dorsal commissureloDLlateral dorsal horizontal tract
trCMcentral complex primordium
DPLal33crMBlDAC1anterior dorsal commissureloDLlateral dorsal horizontal tract
trCMcentral complex primordium
DPLd1crMBdlanterior collarDAC1anterior dorsal commissure
DPLc11crMBdltanterior collarloDMdorsal-horizontal tract
DPLc21dplcmedial intracerebral cascadeloDMdorsal-horizontal tract
DPLc31dplcmedial intracerebral cascadeloDMdorsal-horizontal tract
DPLc41dplcmedial intracerebral cascadeloDMdorsal-horizontal tract
DPLc51dplcmedial intracerebral cascadeloDMdorsal-horizontal tract
DPLl11dplllateral intracerebral cascadeloDLvlateral dorsal horizontal tract
DPLl22dplllateral intracerebral cascadeloDLd/vlateral dorsal horizontal tract
DPLl32dplllateral intracerebral cascadeloDLd/vlateral dorsal horizontal tract
DPLp12trDLloDLlateral dorsal horizontal tract
trDp > DPC2lateral horn commissure
DPLp22trDLloDLlateral dorsal horizontal tract
trDp > DPC2lateral horn commissure
DPLm11trDL to lateral
DPLm21trDL to lateral
DPLcv2crMBpv
CP12cp1vtrDplateral horn commissureloDMdorsal-horizontal tract
CP22crMBpvtrDplateral horn commissureloDMdorsal-horizontal tract
CP32crMBpvtrDplateral horn commissureloDMdorsal-horizontal tract
CP41crMBpv
BLAv11trBL > VPC2optic foci commissure anteriorexBLfascicle optic foci?
BLAv21trBL > VPC2optic foci commissure anteriorexBLfascicle optic foci?
BLAd11trDLexDL
BLAd21trDLexDL
BLAd31trDLexDL
BLAd41trDLexDL
BLAl2crMBpvltrDLexBL > exDL
BLAvm1crMBpvlexBL
BLD12trDLexDL
BLD21trDLexDL
BLD31trDLexDL
BLD42trDLexDL
trBL
BLD52trBLoptic foci commissure anteriorLobula B2
BLP11exBLfascicle optic foci?
BLP21exBLfascicle optic foci?
BLP31trDLexDL
BLP41trDLexDL
BLP51exBLfascicle optic foci?
BLVa11exVT
BLVa21exVT
BLVa31exVT
BLVp12trBLoptic foci commissure anteriorexBLfascicle optic foci?
LVp22trBLoptic foci commissure anteriorexBLfascicle optic foci?
BLVp5exBLfascicle optic foci?
  • The names of lineages are given in column 1; column 2 indicates the number of branches formed by SAT at point of entry into neuropile. All other columns specify the neuropile tract systems joined by the SATs. SAT trajectories are ordered by cardinal direction. If the SAT of a given lineage (see, for example, DALv2) enters one of the circumferential systems of the mushroom body or antennal lobe, this is listed in column 3/4. If the same tract has also an element (e.g., a branch or simply the continuation of the circumferential tract) that runs in a transverse direction, this is listed in column 5/6. Likewise, longitudinal and vertical elements of SAT trajectories are given in columns 7/8 and 9/10, respectively. Columns 3, 5, 7, and 9 give names introduced in this paper for larval tracts; the adjacent columns (4, 6, 8, 10) provide the names of the adult counterpart, where known or suspected. Lineages and lineage tracts: BAla1-4, Basoanterior lineages, anterior-lateral subgroup, 1-4; BAlc1-2, basoanterior lineages, caudo-lateral subgroup, 1-2; BAlp1-3, basoanterior lineages, posterolateral subgroup, 1-3; BAlv, basoanterior lineages, ventrolateral subgroup; BAmas1-2, basoanterior lineages, medial ascending subgroup, 1-2; BAmd1-2, basoanterior lineages, dorsomedial subgroup, 1-2; BAmv1-3, basoanterior lineages, ventromedial subgroup, 1-3; BLAd1-4, anterior basolateral lineages, dorsal subgroup, 1-4; BLAl1-2, anterior basolateral lineages, lateral subgroup, 1-2; BLAv1-2, ventral basolateral lineages, ventral subgroup, 1-2; BLAvm, anterior basolateral lineages, ventromedial; BLD1-5, dorsal basolateral lineages 1-5; BLP1-5, posterior basolateral lineages 1-5; BLVa1-3, ventral basolateral lineages, anterior subgroup, 1-3; BLVp1-3, ventral basolateral lineages, posterior subgroup, 1-3; CM1-5, centro-medial lineages 1-5; CP1-4, centro-posterior lineages 1-4; DALcl1-2, lateral dorsoanterior lineages, centro-lateral subgroup, 1-2; DALcm1-2, lateral dorsoanterior lineages, centro-medial subgroup, 1-2; DALd, lateral dorsoanterior lineages, dorsal subgroup; DALl, lateral dorsoanterior lineages, lateral subgroup; DALv1-3, lateral dorsoanterior lineages, ventral subgroup, 1-3; DAMd1-3, medial dorsoanterior lineages, dorsal subgroup, 1-3; DAMv1-2, medial dorsoanterior lineages, ventral subgroup, 1-2; DPLal1-3, lateral dorsoposterior lineages, antero-lateral subgroup, 1-3; DPLam, lateral dorsoposterior lineages, antero-medial subgroup; DPLc1-5, lateral dorsoposterior lineages, central subgroup, 1-5; DPLd, lateral dorsoposterior lineages, dorsal subgroup; DPLl1-3, lateral dorsoposterior lineages, lateral subgroup, 1-3; DPLm1-2, lateral dorsoposterior lineages, medial subgroup, 1-2; DPLp1-2, lateral dorsoposterior lineages, posterior subgroup, 1-3; DPMl1-4, medial dorsoposterior lineages, lateral subgroup, 1-4; DPMm1-3, medial dorsoposterior lineages, medial subgroup, 1-3; DPMpl1-4, medial dorsoposterior lineages, posterolateral subgroup, 1-4; DPMpm 1-2, medial dorsoposterior lineages, posteromedial subgroup, 1-2; MB 1-4, mushroom body lineages 1-4; TRco, commissural tritocerebral lineage; TRdl, dorsolateral tritocerebral lineage; TRdm, dorsomedial tritocerebral lineage; TRvl, ventrolateral tritocerebral lineage; TRvm, ventromedial tritocerebral lineage. Axon tract systems: ABT, Antero-basal tracts (crAN, veBC, et al.); ACO, antennal commissure (VAC2); ACT, antenno-cerebral tract; bm, basomedial component of antenno-cerebral tract; ATT, anterior transverse tracts (crMBdl, trDL, et al.); CAPT, centro-anterior protocerebral tract; crAN, circumferential tracts of antennal lobe; crMB, circumferential tracts of the mushroom body; dl, around dorsal lobe; l, lateral; mlv, ventral of medial lobe; pp, around proximal peduncle; pv, ventral of peduncle; pvl, ventrolateral of peduncle; DAC, 1-4, dorsoanterior commissures 1-4; DACd, DAC3/4; DACr, DAC1; DPC 1-3, dorsoposterior commissures 1-3; DPPT, veBC; exBL, external basolateral tract system; exDL, external dorsolateral tract system; exVT, external vertical tract system; LCOTd, lateral commissural optic tract (trPd); LCT, lateral cervical tract (continuation of CAPT); LCTco, commissural component of LCT (trBL); loBM, basomedial longitudinal tract system; loC, central longitudinal tract system (ACT, et al.); loDL, longitudinal dorsolateral tract system; loDM, dorsomedial longitudinal tract system; d, dorsal component of dorsomedial longitudinal tract system; v, ventral component of dorsomedial longitudinal tract system; meB, median bundle; MCT, medial cervical tract (meB); MOT, medial optic tract (exBL, crMBpp, et al.); trBL, transverse basolateral tract system; trCM, transverse centro-medial tract system; trDL, transverse dorsolateral tract system; trPd, transverso posterodorsal tract system; VAC 1-4, ventroanterior commissures 1-4; veBC, vertical basocentral tract system; VPC 1-3, ventroposterior commissures 1-3. Neuropile compartments: BA, Basal anterior (antennal) compartment; BC, basal central compartment; BCv, basal cervical compartment; BPL, basal posterolateral compartment; BPM, basal posteromedial compartment; CA, central anterior compartment; CPI, central postero-intermediate compartment; CPL, central posterolateral compartment; d, dorsal component of CPL; CPM, central posteromedial compartment; CX, calyx of mushroom body; DA, dorsal anterior compartment; dl, dorsal lobe of mushroom body; DP, dorsal posterior compartment; LON, larval optic neuropile; ml, medial lobe of mushroom body; OL, optic lobe; ped, peduncle of mushroom body; SEG, subesophageal ganglion; sp, spur of mushroom body; TR, tritocerebrum.