FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
Help Close All Open All
General Information
Term larval VT1 motor neuron ID (Ontology) FBbt:00110279 (Fly Anatomy)
Definition Larval motor neuron of the NB4-1 lineage that innervates the external ventral transverse muscle 1 (VT1), which is only found in A2 and more posterior segments (Landgraf et al., 1997; Zarin et al., 2019). It migrates medially and posteriorly during embryonic development (Schmid et al., 1999). Its dendritic domain is located posterior to the dendritic domain of the ISN motor neurons (Landgraf et al., 2003). It follows the transverse nerve and synapses to the VT1 muscle in the anterior part of the of the next posterior segment via type Ib boutons (Landgraf et al., 1997; Zarin et al., 2019).[ FlyBase:FBrf0099344 FlyBase:FBrf0112030 FlyBase:FBrf0167986 FlyBase:FBrf0244727 ]
Also Known As "MN-VT1" ; "MN25-Ib" ; "SM"
Comment VT1 muscle in not found in segments anterior to A2, unclear if it is present in A8.
Links to External Ontologies
VFB:FBbt_00110279
Annotations
Records annotated with this term OR any of its CHILD TERMS
No relevant records available
Records annotated with this exact term (annotations to child terms are NOT included)
No relevant records available
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
No relevant statements available
Spanning Tree (Parents/Children)
Only view relationship:
neuron
 |__abdominal neuron_____________________
motor neuron                             |
 |__type Ib motor neuron_________________|
embryonic/larval motor neuron            |
 |__larval external muscle motor neuron__|
 |__larval TN motor neuron_______________|
primary neuron                           |
 |__NB4-1 lineage primary neuron_________|
NB4-1 lineage neuron                     |
 |__NB4-1 lineage primary neuron_________|
                                         larval VT1 motor neuron
                                          |__larval VT1 motor neuron of abdominal 1 neuromere
                                          |__larval VT1 motor neuron of abdominal 2 neuromere
                                          |__larval VT1 motor neuron of abdominal 3 neuromere
                                          |__larval VT1 motor neuron of abdominal 4 neuromere
                                          |__larval VT1 motor neuron of abdominal 5 neuromere
                                          |__larval VT1 motor neuron of abdominal 6 neuromere
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a abdominal neuron
type Ib motor neuron
NB4-1 lineage primary neuron
larval external muscle motor neuron
larval TN motor neuron
Part of
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
VFB:FBbt_00110279