FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
Help Close All Open All
General Information
Term mushroom body output neuron 22 ID (Ontology) FBbt:00100240 (Fly Anatomy)
Definition A neuron whose cell body is located on the posteriorlateral protocerebrum, ventrolateral to the calyx of the adult brain. The cell body fiber projects to and arborizes with the pedunculus where it bifurcates, with one branch turning posteriorly to extensively arborize in the calyx with a few fibers extending into the lateral horn. The other branch projects anteriorly through the pedunculus, turns medially and runs below the medial lobe. The fiber then turns dorsally and bifurcates, forming terminals in the crepine in both hemispheres. There is one of these cells per hemisphere (Aso et al., 2014; Li et al., 2020). It is involved in retrieval of reward and punishment memory (Ichinose et al., 2021). It develops from the larval MBON-a2 (Truman et al., 2023).[ FlyBase:FBrf0205263 FlyBase:FBrf0227179 FlyBase:FBrf0248215 FlyBase:FBrf0248476 FlyBase:FBrf0255928 ]
Also Known As "MB-CP1" ; "MBON-22" ; "MBON-calyx" (for all, see Synonyms field below)
Comment
Links to External Ontologies
VFB:FBbt_00100240
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
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       1
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  Insertions Constructs
 mushroom body output neuron 22 (all annotations which use CV term, excluding "NOT" statements)       1      2      1      3
Spanning Tree (Parents/Children)
Only view relationship:
interneuron
 |__primary interneuron________________________
primary neuron                                 |
 |__primary interneuron________________________|
adult mushroom body output neuron              |
 |__adult typical mushroom body output neuron__|
adult interneuron                              |
 |__adult lateral horn input neuron____________|
input/output neuron                            |
 |__adult lateral horn input neuron____________|
CNS neuron                                     |
 |__supraesophageal ganglion neuron____________|
adult CNS neuron                               |
 |__adult DL2 lineage neuron___________________|
CP3 lineage neuron                             |
 |__adult DL2 lineage neuron___________________|
                                               mushroom body output neuron 22  7 rec.
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a supraesophageal ganglion neuron
adult lateral horn input neuron
adult typical mushroom body output neuron
adult DL2 lineage neuron
primary interneuron
Develops from larval mushroom body output neuron a2
Part of adult brain
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
FlyBrain_NDB:10465
VFB:FBbt_00100240