FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term U neuron ID (Ontology) FBbt:00001564 (Fly Anatomy)
Definition Larval motor neuron that is generated by neuroblast NB7-1, innervates a dorsal or lateral muscle and expresses eve (Cleary and Doe, 2006; Seroka et al., 2020). It is the Notch ON progeny of its ganglion mother cell (Seroka et al., 2020). There are five subtypes, each fasciculating with the intersegmental nerve and terminating on a different muscle according to birth order, with earlier born neurons terminating more distally (Meng et al., 2019).[ FlyBase:FBrf0102831 FlyBase:FBrf0190540 FlyBase:FBrf0241992 FlyBase:FBrf0243538 FlyBase:FBrf0246311 ]
Also Known As "U motor neuron"
Comment
Links to External Ontologies
VFB:FBbt_00001564
Annotations
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      62
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       3
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       6
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      34
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles  Genes Insertions Constructs
 U neuron (all annotations which use CV term, excluding "NOT" statements)      62      1     10      9     34
     U neuron | decreased number | embryonic stage       3       --       --       --       2
     U neuron | ectopic       3       --       --       --       2
     U neuron | ectopic | germline clone       5       --       --       --       --
     U neuron | ectopic | heat sensitive       1       --       --       --       1
     U neuron | embryonic stage       2       --       --       --       1
     U neuron | embryonic stage 13       2       --       --       --       2
     U neuron | embryonic stage | increased number       4       --       --       1      2
     U neuron | increased number      11       --       --       --       9
     U neuron | somatic clone       2       --       --       1       --
Spanning Tree (Parents/Children)
Only view relationship:
Notch ON hemilineage primary neuron
 |__NB7-1 Notch ON hemilineage primary neuron__
NB7-1 lineage primary neuron                   |
 |__lineage NB7-1 primary motor neuron_________|
 |__NB7-1 Notch ON hemilineage primary neuron__|
larval efferent neuron                         |
 |__embryonic/larval motor neuron______________|
primary motor neuron                           |
 |__lineage NB7-1 primary motor neuron_________|
 |__embryonic/larval motor neuron______________|
                                               U neuron  161 rec.
                                                |__larval DA2 motor neuron 30 rec.
                                                |   |__larval A1-7-innervating DA2 motor neuron(+) 2 rec.
                                                |__larval DA3 motor neuron 22 rec.
                                                |   |__larval A1-7-innervating DA3 motor neuron(+) 1 rec.
                                                |__larval DO1 motor neuron 28 rec.
                                                |   |__larval A1-7-innervating DO1 motor neuron(+) 2 rec.
                                                |__larval DO2 motor neuron 26 rec.
                                                |   |__larval A1-7-innervating DO2 motor neuron(+) 1 rec.
                                                |__larval LL1 motor neuron 39 rec.
                                                    |__larval A1-7-innervating LL1 motor neuron(+) 6 rec.
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Is a lineage NB7-1 primary motor neuron
embryonic/larval motor neuron
NB7-1 Notch ON hemilineage primary neuron
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Synonyms
Secondary IDs
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VFB:FBbt_00001564