FB2026_02 , released June 18, 2026

General Information
Term	FBbt:00100223	ID (Ontology)	FBbt:00100223 (Fly Anatomy)
Definition	OBSOLETE "A neuron, whose cell body is located in front of the anterior inferior medial protocerebrum of the adult brain, anterior to the vertical and medial mushroom body lobes (Tanaka et al., 2008). This is a large group of around 50 neurons per hemisphere (Tanaka et al., 2008), which are likely heterogeneous (Aso et al., 2014). The cell body fibers enter the medial lobe through the gap between the gamma and beta' lobes (Tanaka et al., 2008). Within the gamma lobe, neurite projections are limited to the middle segment between the tip and the base of the lobe, named as gamma4 (Tanaka et al., 2008). In the beta' lobe, neurites arborize in the lateral part of the beta'a stratum (beta'a1) and the medial segment of beta'm and beta'p strata (beta'm2 and beta'p2) (Tanaka et al., 2008). At the medial edge of the beta'm and beta'p strata, some of the fibers project to the contralateral lobe (Tanaka et al., 2008).[ FlyBase:FBrf0205263 FlyBase:FBrf0227179 ]
Also Known As	"MB-AIM"
Comment	Obsoleted as it is not clear which cell types are included/partially included in this class. Cells are mostly (or perhaps exclusively) PAM neurons, based on Aso et al. (2014). Tanaka et al. (2008) refer to the MB-AIM as 'MB-APM' on one occasion, perhaps by mistake.
Links to External Ontologies

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
Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
No relevant statements available

General Information

Term

FBbt:00100223

ID (Ontology)

FBbt:00100223 (Fly Anatomy)

Definition

OBSOLETE "A neuron, whose cell body is located in front of the anterior inferior medial protocerebrum of the adult brain, anterior to the vertical and medial mushroom body lobes (Tanaka et al., 2008). This is a large group of around 50 neurons per hemisphere (Tanaka et al., 2008), which are likely heterogeneous (Aso et al., 2014). The cell body fibers enter the medial lobe through the gap between the gamma and beta' lobes (Tanaka et al., 2008). Within the gamma lobe, neurite projections are limited to the middle segment between the tip and the base of the lobe, named as gamma4 (Tanaka et al., 2008). In the beta' lobe, neurites arborize in the lateral part of the beta'a stratum (beta'a1) and the medial segment of beta'm and beta'p strata (beta'm2 and beta'p2) (Tanaka et al., 2008). At the medial edge of the beta'm and beta'p strata, some of the fibers project to the contralateral lobe (Tanaka et al., 2008).[ FlyBase:FBrf0205263 FlyBase:FBrf0227179 ]

Also Known As

"MB-AIM"

Comment

Obsoleted as it is not clear which cell types are included/partially included in this class. Cells are mostly (or perhaps exclusively) PAM neurons, based on Aso et al. (2014). Tanaka et al. (2008) refer to the MB-AIM as 'MB-APM' on one occasion, perhaps by mistake.

Links to External Ontologies

Annotations

Records annotated with this term OR any of its CHILD TERMS

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

No relevant statements available

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Synonyms & Secondary IDs
Synonyms
	"MB-AIM" EXACT[ FlyBase:FBrf0205263 ] "MB-APM" NARROW[ FlyBase:FBrf0205263 ]
Secondary IDs

External Crossreferences & Linkouts

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Parents/Children
View Depth

Relationships

Is a

Part of

Synonyms & Secondary IDs

Synonyms

"MB-AIM" EXACT[ FlyBase:FBrf0205263 ]
"MB-APM" NARROW[ FlyBase:FBrf0205263 ]

Secondary IDs

External Crossreferences & Linkouts