| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Entire meningeal spaces | Is a | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier |  | 
| Structure of epidural space | Is a | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier |  | 
| Subarachnoid space structure | Is a | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier |  | 
| Subdural space structure | Is a | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier |  | 
| Replacement of subarachnoid/subdural catheter | Procedure site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Structure of brain meningeal space | Is a | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier |  | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of chemotherapeutic agent | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of antibiotic | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of radiological dye | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of spinal anesthetic agent for analgesia | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Replacement of subarachnoid/subdural catheter | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid perfusion of spinal cord with refrigerated saline | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Lateral cervical spinal canal puncture with injection | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Injection of destructive substance into cerebrospinal fluid | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of therapeutic substance into cerebrospinal fluid | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of cerebrospinal fluid shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subarachnoid, continuous | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Cerebral ventricular shunt to venous system | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Subarachnoid-ureteral spinal shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Ventriculoatrial anastomosis with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Intrathecal neurolysis of sacral roots | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of spinal shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of ventriculo-auricular shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Intrathecal neurolytic injection | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Ventriculocaval shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Injection of anesthetic substance, therapeutic, subarachnoid, differential | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid-ureteral spinal shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of shunt from intracranial subdural space | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Intrathecal injection of local anesthetic agent | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Extracranial ventricular shunt replaced | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subdural, differential | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of cerebral ventriculo-atrial shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of ventriculo-jugular shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Ventricular shunt to circulatory system | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Injection of anesthetic substance, therapeutic, subdural, continuous | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of anesthetic substance, diagnostic, subarachnoid, continuous | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid-ureteral spinal shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of lumboperitoneal shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of lumbar subarachnoid-pleural shunt with laminectomy | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of thecoperitoneal shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 4 | 
| Ventricular shunt to circulatory system | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of ventriculo-jugular shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of subdural-peritoneal shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 6 | 
| Creation of shunt from intracranial subdural space | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of lumbar subcutaneous shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Subarachnoid-peritoneal spinal shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 4 | 
| Cerebral ventricular shunt to venous system | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of lumbar subarachnoid-peritoneal shunt with laminectomy | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 4 | 
| Subarachnoid-ureteral spinal shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of cerebrospinal fluid shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Ventriculoatrial anastomosis with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Ventriculocaval shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of ventriculo-auricular shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Spinal salpingothecal shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of spinal shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of thecopleural shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of connection from spinal subarachnoid space | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of subdural-pleural shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 5 | 
| Creation of cerebral ventriculo-atrial shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of lumbar subarachnoid shunt with laminectomy | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of lumbar shunt including laminectomy | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 4 | 
| Injection of anesthetic substance, therapeutic, subdural, continuous | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of cerebrospinal fluid shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subdural, differential | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of anesthetic substance, therapeutic, subarachnoid, continuous | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Administration of drug or medicament via intrathecal route | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subarachnoid, differential | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of shunt from intracranial subdural space | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid perfusion of spinal cord with refrigerated saline | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, diagnostic, subarachnoid, continuous | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid-ureteral spinal shunt | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid-ureteral spinal shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of local anesthetic agent | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of radiological dye | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of chemotherapeutic agent | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Administration of drug or medicament via intrathecal route | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of antibiotic | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of spinal shunt with valve | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of intrathecal catheter using fluoroscopic guidance | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of intrathecal catheter using fluoroscopic guidance | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Intrathecal neurolysis of sacral roots | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Intrathecal neurolytic injection | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Hemorrhage into meningeal space of neuraxis | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Structure of spinal cord meningeal space | Is a | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier |  | 
| Structure of subpial space of neuraxis | Is a | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier |  | 
| Thoracic hydromeningocele | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 4 | 
| Hydromeningocele | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Spinal hydromeningocele | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital spinal hydromeningocele | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 2 | 
| Hydromeningomyelocele | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Hydromeningocele - cranial | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Hydrencephalomeningocele | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 5 | 
| Acquired hydromeningocele | Finding site | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal block using fluoroscopic guidance (procedure) | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 3 | 
| Intrathecal block using fluoroscopic guidance (procedure) | Procedure site - Indirect | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 4 | 
| Intrathecal block using fluoroscopic guidance (procedure) | Procedure site - Direct | False | Structure of meningeal space | Inferred relationship | Existential restriction modifier | 1 |