Status: current, Not sufficiently defined by necessary conditions definition status. Date: 31-Jan 2002. Module: SNOMED CT core module
Descriptions:
| Id | Description | Lang | Type | Status | Case? | Module | 
| 130250015 | External sheath of optic nerve | en | Synonym | Active | Entire term case insensitive | SNOMED CT core module | 
| 503856010 | Structure of external sheath of optic nerve | en | Synonym | Active | Entire term case insensitive | SNOMED CT core module | 
| 819443013 | Structure of external sheath of optic nerve (body structure) | en | Fully specified name | Active | Entire term case insensitive | SNOMED CT core module | 
| 1495456016 | Dura mater of optic nerve | en | Synonym | Active | Entire term case insensitive | SNOMED CT core module | 
| Outbound Relationships | Type | Target | Active | Characteristic | Refinability | Group | Values | 
| Structure of external sheath of optic nerve | Is a | Optic nerve sheath structure | true | Inferred relationship | Existential restriction modifier | ||
| Structure of external sheath of optic nerve | Part of | Entire optic nerve sheath | false | Additional relationship | Existential restriction modifier | ||
| Structure of external sheath of optic nerve | Is a | Cranial nerve part | true | Inferred relationship | Existential restriction modifier | ||
| Structure of external sheath of optic nerve | Laterality | Side | true | Inferred relationship | Existential restriction modifier | 
| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Entire external sheath of optic nerve | Is a | True | Structure of external sheath of optic nerve | Inferred relationship | Existential restriction modifier | 
This concept is not in any reference sets