| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Pathologic calcification, calcified structure | Is a | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier |  | 
| Congenital ectopia (morphologic abnormality) | Is a | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier |  | 
| Submerging tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Early tooth exfoliation | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Erupted mesiodens | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Delayed generalized tooth eruption due to systemic disease | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Delayed generalized tooth eruption unrelated to systemic disease | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Delayed exfoliation of single tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Failure of exfoliation of primary teeth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Disturbance of tooth eruption or exfoliation | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Neonatal tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Natal tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Ectopic placenta | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Abnormal tooth eruption | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Ectopic fetus | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Late tooth eruption | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Persistent primary tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Obstructed tooth eruption | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Persistent primary tooth eruption | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Altered passive eruption of teeth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Generalized precocious exfoliation of teeth related to systemic disease | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Precocious exfoliation due to ectopic eruption of proximate tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Precocious exfoliation of teeth due to idiopathic root resorption | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Precocious exfoliation of teeth due to root resorption following trauma | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Delayed single tooth exfoliation associated with previous trauma | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Delayed generalized exfoliation of teeth unrelated to systemic disease | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Failure of exfoliation associated with lack of succedaneous tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Failure of exfoliation associated with ectopic eruption of succedaneous tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Failure of tooth eruption | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Generalized failure of tooth eruption associated with systemic disease | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Failure of tooth eruption associated with tooth impaction | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Premature tooth eruption | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Tooth eruption disturbances NOS | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital ectopia | Is a | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier |  | 
| Ectopic pupil | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Midbrain corectopia | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Ectopic pupil | Associated morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Precocious exfoliation due to ectopic eruption of proximate tooth | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Midbrain corectopia | Associated morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Neuronal heterotopia | Is a | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier |  | 
| Acquired heterotopic structure | Is a | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier |  | 
| Excision of heterotopic bone from muscle of hand | Direct morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 3 | 
| Excision of heterotopic bone from muscle | Direct morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 2 | 
| Ectopic tissue | Is a | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier |  | 
| Splenosis | Associated morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Ectopic gray matter in centrum ovale | Associated morphology | False | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Fordyce spots of lips | Associated morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Fordyce spots of buccal mucosa | Associated morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Fordyce's disease | Associated morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 | 
| Distichiasis | Associated morphology | True | Heterotopic structure, either congenital or acquired | Inferred relationship | Existential restriction modifier | 1 |