FB2026_03 , released September 17, 2026
CV Term Report
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Term larval A1-7-innervating ISN motor neuron ID (Ontology) FBbt:00110216 (Fly Anatomy)
Definition Motor neuron that innervates the muscles of larval abdominal segments A1-7 and which fasciculates with the intersegmental nerve. Except for RP2 (dorsal motor neuron) their somas are located in the next anterior segment to the muscles they innervate (Zarin and Labrador, 2019). The dendritic domain of the motor neuron is located anteriorly to the dendritic domain of the motorneurons that innervate external muscles.[ FlyBase:FBrf0064793 FlyBase:FBrf0099344 FlyBase:FBrf0167986 FlyBase:FBrf0245882 ]
CommentThere is little or no published literature specifically on innervation in A1 and so where equivalent muscles are present between A1 and A2-7 (Landgraf et al., 1997; Schmid et al., 1999), we infer A1 motor neuron innervation patterns from those of A2-7.
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VFB:FBbt_00110216
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 larval A1-7-innervating ISN motor neuron (all annotations which use CV term, excluding "NOT" statements)
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Vocabulary search 
larval neuron
 |__larval abdominal intersegmental nerve neuron__
larval efferent neuron                            |
 |__embryonic/larval motor neuron_________________|
primary motor neuron                              |
 |__embryonic/larval motor neuron_________________|
                                                  larval A1-7-innervating ISN motor neuron  49 rec.
                                                   |__larval A1-7-innervating DT1 motor neuron
                                                   |   |__larval DT1 motor neuron of abdominal 1 neuromere
                                                   |   |__larval DT1 motor neuron of abdominal 2 neuromere
                                                   |   |__larval DT1 motor neuron of abdominal 3 neuromere
                                                   |   |__larval DT1 motor neuron of abdominal 4 neuromere
                                                   |   |__larval DT1 motor neuron of abdominal 5 neuromere
                                                   |   |__larval DT1 motor neuron of abdominal 6 neuromere
                                                   |   |__larval DT1 motor neuron of metathoracic neuromere
                                                   |__larval A1-7-innervating RP2 motor neuron 21 rec.
                                                   |   |__larval RP2 motor neuron of abdominal 1 neuromere 3 rec.
                                                   |   |__larval RP2 motor neuron of abdominal 2 neuromere 1 rec.
                                                   |   |__larval RP2 motor neuron of abdominal 3 neuromere 1 rec.
                                                   |   |__larval RP2 motor neuron of abdominal 4 neuromere 1 rec.
                                                   |   |__larval RP2 motor neuron of abdominal 5 neuromere 1 rec.
                                                   |   |__larval RP2 motor neuron of abdominal 6 neuromere 1 rec.
                                                   |   |__larval RP2 motor neuron of abdominal 7 neuromere 1 rec.
                                                   |__larval A1-7-innervating RP5 motor neuron 11 rec.
                                                   |   |__larval RP5 motor neuron of abdominal 1 neuromere
                                                   |   |__larval RP5 motor neuron of abdominal 2 neuromere
                                                   |   |__larval RP5 motor neuron of abdominal 3 neuromere
                                                   |   |__larval RP5 motor neuron of abdominal 4 neuromere
                                                   |   |__larval RP5 motor neuron of abdominal 5 neuromere
                                                   |   |__larval RP5 motor neuron of abdominal 6 neuromere
                                                   |   |__larval RP5 motor neuron of metathoracic neuromere
                                                   |__larval A1-7-innervating V motor neuron
                                                   |   |__larval V motor neuron of abdominal 1 neuromere
                                                   |   |__larval V motor neuron of abdominal 2 neuromere
                                                   |   |__larval V motor neuron of abdominal 3 neuromere
                                                   |   |__larval V motor neuron of abdominal 4 neuromere
                                                   |   |__larval V motor neuron of abdominal 5 neuromere
                                                   |   |__larval V motor neuron of abdominal 6 neuromere
                                                   |   |__larval V motor neuron of metathoracic neuromere
                                                   |__larval A1-7-innervating ventral VUM motor neuron 3 rec.
                                                   |   |__larval ventral VUM motor neuron of abdominal 1 neuromere 3 rec.
                                                   |   |__larval ventral VUM motor neuron of abdominal 2 neuromere 3 rec.
                                                   |   |__larval ventral VUM motor neuron of abdominal 3 neuromere 3 rec.
                                                   |   |__larval ventral VUM motor neuron of abdominal 4 neuromere 3 rec.
                                                   |   |__larval ventral VUM motor neuron of abdominal 5 neuromere 3 rec.
                                                   |   |__larval ventral VUM motor neuron of abdominal 6 neuromere 3 rec.
                                                   |   |__larval ventral VUM motor neuron of abdominal 7 neuromere 3 rec.
                                                   |__larval A1-7-innervating VL1 motor neuron
                                                   |   |__larval VL1 motor neuron of abdominal 1 neuromere
                                                   |   |__larval VL1 motor neuron of abdominal 2 neuromere
                                                   |   |__larval VL1 motor neuron of abdominal 3 neuromere
                                                   |   |__larval VL1 motor neuron of abdominal 4 neuromere
                                                   |   |__larval VL1 motor neuron of abdominal 5 neuromere
                                                   |   |__larval VL1 motor neuron of abdominal 6 neuromere
                                                   |   |__larval VL1 motor neuron of metathoracic neuromere
                                                   |__larval A1-7-innervating VL2 motor neuron 1 rec.
                                                   |   |__larval VL2 motor neuron of abdominal 1 neuromere
                                                   |   |__larval VL2 motor neuron of abdominal 2 neuromere
                                                   |   |__larval VL2 motor neuron of abdominal 3 neuromere
                                                   |   |__larval VL2 motor neuron of abdominal 4 neuromere
                                                   |   |__larval VL2 motor neuron of abdominal 5 neuromere
                                                   |   |__larval VL2 motor neuron of abdominal 6 neuromere
                                                   |   |__larval VL2 motor neuron of metathoracic neuromere
                                                   |__larval dorsal A1-7-innervating ISN motor neuron 7 rec.
                                                   |   |__larval A1-7-innervating DA1 motor neuron(+) 4 rec.
                                                   |   |__larval A1-7-innervating DA3 motor neuron(+) 1 rec.
                                                   |   |__larval A1-7-innervating DO1 motor neuron(+) 2 rec.
                                                   |   |__larval A1-7-innervating DO2 motor neuron(+) 1 rec.
                                                   |   |__larval A1-7-innervating DO3 motor neuron(+)
                                                   |   |__larval A1-7-innervating DO4 motor neuron(+)
                                                   |   |__larval DO5 motor neuron(+) 2 rec.
                                                   |__larval lateral A1-7-innervating ISN motor neuron 16 rec.
                                                   |   |__larval A1-7-innervating DA2 motor neuron(+) 2 rec.
                                                   |   |__larval A1-7-innervating LL1 motor neuron(+) 6 rec.
                                                   |   |__larval A1-7-innervating VL3/4 motor neuron(+) 10 rec.
                                                   |   |__larval A1-7-innervating VO1 motor neuron(+) 6 rec.
                                                   |   |__larval A1-7-innervating VO2 motor neuron(+) 8 rec.
                                                   |__larval ventral A1-7-innervating ISN motor neuron 1 rec.
                                                       |__larval A1-7-innervating VO3 motor neuron(+)
                                                       |__VO4-6 motor neuron(+) 1 rec.
                                                       |__VO4/5 motor neuron(+) 1 rec.
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Is a larval abdominal intersegmental nerve neuron
embryonic/larval motor neuron
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VFB:FBbt_00110216