FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

optic lobe pioneer neuron

ID (Ontology)

FBbt:00003703 (Fly Anatomy)

Definition

Neuron located in the distal region of the optic lobe (Tix et al., 1989), which persists through development and pioneers Bolwig's nerve. In the developing optic lobe, at larval stage, this group of three neurons are fully differentiated before there is any detectable fiber growth in the rest of the optic lobe. Following this, other neuron projections from the optic lobe follow the same path as these pioneers and fasciculate to form Bolwig's nerve (Tix et al., 1989). They have their cell bodies located together on the ventrolateral side of the larval optic neuropil (Larderet et al., 2017).[ FlyBase:FBrf0049574 FlyBase:FBrf0237760 ]

Also Known As

"OLP"

Comment

Tix et al. (1989) state that in 57 out of 62 third instar larval brain samples only three optic pioneer neurons were observed. However, they found three brains showing four of these neurons, and two cases displaying only two. Larderet et al., 2017 also found variability - three in the left hemisphere, four in the right hemisphere.

Links to External Ontologies

VFB:FBbt_00003703

Annotations

Records annotated with this term OR any of its CHILD TERMS

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Direct annotations: records annotated with this exact term (child terms are NOT included)

Data Class	Field	Direct annotations
Insertions (FBti)	EXPRESSION_STAGE_TISSUE_POSITION

Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records

Full annotation statements	Relevant FlyBase reports
Full annotation statements	Insertions	Constructs
optic lobe pioneer neuron (all annotations which use CV term, excluding "NOT" statements)

Spanning Tree (Parents/Children)

neuron
 |__pioneer neuron___________________
efferent neuron                      |
 |__larval efferent neuron___________|
CNS neuron                           |
 |__supraesophageal ganglion neuron__|
larval CNS neuron                    |
 |__larval efferent neuron___________|
                                     optic lobe pioneer neuron  13 rec.
                                      |__optic lobe pioneer neuron 1 3 rec.
                                      |__optic lobe pioneer neuron 2 10 rec.
                                      |__optic lobe pioneer neuron 3 5 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	supraesophageal ganglion neuron pioneer neuron larval efferent neuron
Part of
Synonyms & Secondary IDs
Synonyms
	"OLP" EXACT[ FlyBase:FBrf0049574 ]
Secondary IDs

External Crossreferences & Linkouts
	VFB:FBbt_00003703