Status: current, Not sufficiently defined by necessary conditions definition status (core metadata concept). Date: 31-Jan 2002. Module: SNOMED CT core
Descriptions:
| Outbound Relationships | Type | Target | Active | Characteristic | Refinability | Group | Values | 
| Structure of periaqueductal gray matter | Is a | Space of ventricular system of brain | false | Inferred relationship | Some | ||
| Structure of periaqueductal gray matter | Is a | Midbrain part | false | Inferred relationship | Some | ||
| Structure of periaqueductal gray matter | del av | Entire midbrain | false | Additional relationship | Some | ||
| Structure of periaqueductal gray matter | Is a | Structure of tegmentum of midbrain | true | Inferred relationship | Some | ||
| Structure of periaqueductal gray matter | Laterality | Side | true | Inferred relationship | Some | 
| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Entire periaqueductal gray matter | Is a | True | Structure of periaqueductal gray matter | Inferred relationship | Some | 
Reference Sets
Lateralizable body structure reference set (foundation metadata concept)
Anatomy structure and entire association reference set (foundation metadata concept)