FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term larval LT1/LT2 motor neuron ID (Ontology) FBbt:00110261 (Fly Anatomy)
Definition Larval motor neuron that develops from NB2-2 and innervates the lateral transverse muscles 1 and 2 via type Ib boutons (Landgraf et al., 1997; Schmid et al, 1999; Hoang and Chiba, 2001; Kim et al., 2009). It has ipsilateral dendrites that extend anteriorly in the dorsolateral neuropil (Landgraf et al., 1997; Landgraf et al., 2003; Kim et al., 2009). 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; Kim et al., 2009).[ FlyBase:FBrf0099344 FlyBase:FBrf0112030 FlyBase:FBrf0132289 FlyBase:FBrf0167986 FlyBase:FBrf0209293 ]
Also Known As"MN-LT1" ; "MN21/22-Ib"
CommentIdentified as LT1-innervating in Landgraf et al. (1997), subsequent studies find only one LT1 neuron, which also innervates LT2 and has similar (ipsilateral and SNa) morphology (Hoang and Chiba, 2001; Kim et al., 2009).
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VFB:FBbt_00110261
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 larval LT1/LT2 motor neuron (all annotations which use CV term, excluding "NOT" statements)
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motor neuron
 |__type Ib motor neuron_________________
embryonic/larval motor neuron            |
 |__larval external muscle motor neuron__|
NB2-2 lineage primary neuron             |
 |__lineage NB2-2 primary motor neuron___|
primary motor neuron                     |
 |__lineage NB2-2 primary motor neuron___|
                                         larval LT1/LT2 motor neuron  1 rec.
                                          |__larval A1-7-innervating LT1/LT2 motor neuron
                                              |__larval LT1/LT2 motor neuron of abdominal 1 neuromere
                                              |__larval LT1/LT2 motor neuron of abdominal 2 neuromere
                                              |__larval LT1/LT2 motor neuron of abdominal 3 neuromere
                                              |__larval LT1/LT2 motor neuron of abdominal 4 neuromere
                                              |__larval LT1/LT2 motor neuron of abdominal 5 neuromere
                                              |__larval LT1/LT2 motor neuron of abdominal 6 neuromere
                                              |__larval LT1/LT2 motor neuron of abdominal 7 neuromere
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Is a lineage NB2-2 primary motor neuron
type Ib motor neuron
larval external muscle motor neuron
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VFB:FBbt_00110261