FB2026_03 , released September 17, 2026
CV Term Report
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Term larval A1-7-innervating DA2 motor neuron ID (Ontology) FBbt:00002311 (Fly Anatomy)
Definition Larval DO1 motor neuron that innervates a muscle of segments A1-7. Its dendritic arborization occupies the lateral and intermediate domains of the ventral nerve cord neuropil. It exits the ventral nerve cord via the anterior root of the intersegmental nerve and innervates the DA2 muscle with type Ib boutons (Landgraf et al., 1997; Hoang and Chiba, 2001). The muscle it innervates is one segment posterior to its soma (Zarin and Labrador, 2019).[ FlyBase:FBrf0099344 FlyBase:FBrf0112030 FlyBase:FBrf0132289 FlyBase:FBrf0160715 FlyBase:FBrf0167986 FlyBase:FBrf0174847 FlyBase:FBrf0208790 FlyBase:FBrf0229965 FlyBase:FBrf0244727 FlyBase:FBrf0245882 ]
Also Known As"A1-7 U3 motor neuron" ; "abdominal A1-7 DA2 motor neuron" ; "MN-DA2 neuron" (for all, see Synonyms field below)
CommentThis motor neuron is an exception to the class of motorneurons that innervate the internal dorsal muscles whose dendrites occupy the lateral neuropil; it has dendrites in the intermediate and lateral regions (Mauss et al., 2009). Previously thought to correspond to the U2 neuron based on personal communication from Matthias Landgraf - FBrf0221138, but shown to be U3 by Meng et al. (2019).
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VFB:FBbt_00002311
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 larval A1-7-innervating DA2 motor neuron (all annotations which use CV term, excluding "NOT" statements)
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U neuron
 |__larval DA2 motor neuron___________________________
embryonic/larval motor neuron                         |
 |__abdominal segment motor neuron____________________|
type Ib motor neuron                                  |
 |__larval DA2 motor neuron___________________________|
larval internal muscle motor neuron                   |
 |__larval DA2 motor neuron___________________________|
larval A1-7-innervating ISN motor neuron              |
 |__larval lateral A1-7-innervating ISN motor neuron__|
                                                      larval A1-7-innervating DA2 motor neuron  2 rec.
                                                       |__larval DA2 motor neuron of abdominal 1 neuromere
                                                       |__larval DA2 motor neuron of abdominal 2 neuromere
                                                       |__larval DA2 motor neuron of abdominal 3 neuromere
                                                       |__larval DA2 motor neuron of abdominal 4 neuromere
                                                       |__larval DA2 motor neuron of abdominal 5 neuromere
                                                       |__larval DA2 motor neuron of abdominal 6 neuromere
                                                       |__larval DA2 motor neuron of metathoracic neuromere
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Is a larval DA2 motor neuron
abdominal segment motor neuron
larval lateral A1-7-innervating ISN motor neuron
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VFB:FBbt_00002311