FB2026_03 , released September 17, 2026
CV Term Report
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Term larval LT3/LT4 motor neuron ID (Ontology) FBbt:00110270 (Fly Anatomy)
Definition Larval motor neuron that develops from NB3-2 and innervates the lateral transverse muscles 3 and 4 via type Ib boutons (Landgraf et al., 1997; Schmid et al, 1999; Hoang and Chiba, 2001; Wang et al., 2022). It arborizes in the ipsilateral neuropil, and its axon fasciculates with the ipsilateral segmental nerve, innervating muscles of the same segment as its soma (Landgraf et al., 1997; Schmid et al, 1999; Hoang and Chiba, 2001).[ FlyBase:FBrf0099344 FlyBase:FBrf0112030 FlyBase:FBrf0132289 FlyBase:FBrf0253566 ]
Also Known As"LT3/LT4 motor neuron" ; "MN-LT4" ; "MN23/24-Ib"
CommentIdentified as LT4-innervating in Landgraf et al. (1997), subsequent studies find only one LT4 neuron, which also innervates LT3 and has similar (ipsilateral and SNa) morphology (Hoang and Chiba, 2001; Wang et al., 2022).
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VFB:FBbt_00110270
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 larval LT3/LT4 motor neuron (all annotations which use CV term, excluding "NOT" statements)
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lineage NB3-2 primary motor neuron
 |__larval NB3-2 segmental nerve primary motor neuron__
motor neuron                                           |
 |__type Ib motor neuron_______________________________|
embryonic/larval motor neuron                          |
 |__larval NB3-2 segmental nerve primary motor neuron__|
 |__larval external muscle motor neuron________________|
                                                       larval LT3/LT4 motor neuron  1 rec.
                                                        |__larval A1-7-innervating LT3/LT4 motor neuron
                                                            |__larval LT3/LT4 motor neuron of abdominal 1 neuromere
                                                            |__larval LT3/LT4 motor neuron of abdominal 2 neuromere
                                                            |__larval LT3/LT4 motor neuron of abdominal 3 neuromere
                                                            |__larval LT3/LT4 motor neuron of abdominal 4 neuromere
                                                            |__larval LT3/LT4 motor neuron of abdominal 5 neuromere
                                                            |__larval LT3/LT4 motor neuron of abdominal 6 neuromere
                                                            |__larval LT3/LT4 motor neuron of abdominal 7 neuromere
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Is a larval NB3-2 segmental nerve primary motor neuron
type Ib motor neuron
larval external muscle motor neuron
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VFB:FBbt_00110270