FB2026_03 , released September 17, 2026
CV Term Report
Help Close All Open All
General Information
Term apterous-expressing neuron of the lateral cluster of the thorax ID (Ontology) FBbt:00110868 (Fly Anatomy)
Definition Primary interneuron that expresses apterous and is found in a relatively lateral position within an embryonic or larval thoracic neuromere (Lundgren et al., 1995). There are four of these neurons per thoracic hemisegment and they are born at the end of the primary lineage of NB5-6T, with Ap1 generated at stage 13, followed by Ap2, Ap3 and Ap4 (Baumgardt et al., 2007; Baumgardt et al., 2009). They are generated directly from the neuroblast, without a ganglion mother cell intermediate (Baumgardt et al., 2009).[ FlyBase:FBrf0078940 FlyBase:FBrf0184217 FlyBase:FBrf0195184 FlyBase:FBrf0209429 ]
Also Known As"Ap cluster" ; "ap cluster" ; "Ap cluster neuron"
CommentNon-thoracic segments may have dorsal and ventral Ap neurons, but no lateral clusters.
Links to External Ontologies
VFB:FBbt_00110868
Annotations
Records annotated with this term OR any of its CHILD TERMS

Choose a record type to view annotations for this term and its child terms. Direct annotations and full annotation statements below also provide HitList buttons.

    • Results list data from multiple species. Choose a record type above to open its HitList.
Direct annotations: records annotated with this exact term (child terms are NOT included)
Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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
 apterous-expressing neuron of the lateral cluster of the thorax (all annotations which use CV term, excluding "NOT" statements)
     apterous-expressing neuron of the lateral cluster of the thorax | ectopic
      --       --       --
     apterous-expressing neuron of the lateral cluster of the thorax | embryonic stage
      --
      --
     apterous-expressing neuron of the lateral cluster of the thorax | embryonic stage | increased number
      --       --
     apterous-expressing neuron of the lateral cluster of the thorax | late embryonic stage
      --       --
Spanning Tree (Parents/Children)
Only view relationship:
Vocabulary search 
lineage NB5-6 primary interneuron__
thoracic neuron____________________|
ventral ectoderm derivative________|
larval interneuron_________________|
                                   larval thoracic NB5-6 primary interneuron
                                    |__apterous-expressing neuron of the lateral cluster of the thorax  171 rec.
                                        |__apterous-expressing neuron of the lateral cluster of the thorax Ap1 14 rec.
                                        |__apterous-expressing neuron of the lateral cluster of the thorax Ap2 3 rec.
                                        |__apterous-expressing neuron of the lateral cluster of the thorax Ap3 2 rec.
                                        |__apterous-expressing neuron of the lateral cluster of the thorax Ap4 121 rec.
                                            |__larval mesothoracic Ap4 neuron
                                            |__larval metathoracic Ap4 neuron
                                            |__larval prothoracic Ap4 neuron
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a larval thoracic NB5-6 primary interneuron
Part of
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
VFB:FBbt_00110868