FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
Help Close All Open All
General Information
Term small undifferentiated primary neuron ID (Ontology) FBbt:00049543 (Fly Anatomy)
Definition Primary neuron found in the embryo or larva that remains in an undifferentiated state during early larval stages (Andrade et al., 2019). They have a simple, thin, unbranched process that enters the neuropil, but lacks output synapses (Andrade et al., 2019). At least some of these differentiate into mature adult neurons during late larval and pupal stages (Andrade et al., 2019). In the first instar brain, there are around 802 of these neurons, which is more than 25% of brain primary neurons (Andrade et al., 2019).[ FlyBase:FBrf0241389 ]
Also Known As "embryonically born secondary neuron" ; "primary SU neuron"
Comment
Links to External Ontologies
VFB:FBbt_00049543
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
 |__larval neuron____________
primary neuron               |
 |__immature primary neuron__|
immature neuron              |
 |__immature primary neuron__|
                             small undifferentiated primary neuron
                              |__fan-shaped body pioneer neuron
                              |__larval immature CCAP neuron
                                  |__larval A5-A7 immature CCAP neuron
                                  |__larval A8-A9 immature CCAP neuron
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a larval neuron
immature primary neuron
Part of
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
VFB:FBbt_00049543