| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Structure of cervical subarachnoid space | Is a | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Structure of dorsal subarachnoid space | Is a | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Structure of sacral subarachnoid space | Is a | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Structure of lumbar subarachnoid space | Is a | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Creation of thecoperitoneal shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of lumboperitoneal shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Epidural injection of contrast substance, caudal | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Cervical intrathecal neurolysis | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Thoracic intrathecal neurolysis | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 4 | 
| Lumbar intrathecal neurolysis | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Intrathecal neurolysis of sacral roots | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Cervical epidural neurolysis | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Thoracic epidural neurolysis | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 4 | 
| Sacral epidural neurolysis | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 4 | 
| Lumbar epidural steroid injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Cervical epidural steroid injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Thoracic epidural steroid injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Sacral epidural steroid injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of connection from spinal subarachnoid space | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of thecopleural shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of syringosubarachnoid shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Renewal of spinal subarachnoid shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of spinal subarachnoid shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Cerebrospinal fluid collection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Administration of epidural test dose | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Administration of epidural top-up | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Local anesthetic thoracic epidural block | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 4 | 
| Intrathecal neurolytic injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Local anesthetic cervical epidural block | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 4 | 
| Epidural neurolysis | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Epidural steroid injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Epidural injection of contrast substance, lumbar | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Epidural injection of anesthetic substance, diagnostic, lumbar, continuous | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 4 | 
| Spinal injection of phenol | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Epidural injection of neurolytic solution, caudal | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 4 | 
| Epidural injection of anesthetic substance, therapeutic, lumbar, continuous | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Epidural injection of anesthetic substance, therapeutic, caudal, continuous | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 5 | 
| Intradural spinal arachnoid cyst | Finding site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Traumatic spinal subarachnoid hemorrhage | Finding site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection into cervical epidural space | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection into thoracic epidural space | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection into lumbar epidural space | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection into sacral epidural space | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| External drainage procedure from spinal subarachnoid space | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of spinal anesthetic agent for analgesia | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Epidural anesthesia | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Revision of spinal salpingothecal shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of lumbosubarachnoid shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Spinal pleurothecal shunt with valve | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of spinal saline | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Spinal salpingothecal shunt with valve | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid-peritoneal spinal shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of spinal pleurothecal shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-peritoneal shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of lumbosubarachnoid shunt with valve | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid perfusion of spinal cord with refrigerated saline | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of spinal epidural space | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Replacement of lumbosubarachnoid shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Epidural lumbar injection of blood patch | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-ureteral shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of lumbar subarachnoid-pleural shunt with laminectomy | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of lumbosubarachnoid shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of lumbar subarachnoid-peritoneal shunt with laminectomy | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of subarachnoid-peritoneal shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Injection of neurolytic substance, subarachnoid | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Lateral cervical spinal canal puncture with injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Spinal injection of alcohol | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of subarachnoid-ureteral shunt | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of steroid into spinal canal | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 10 | 
| Creation of lumbar subarachnoid shunt with laminectomy | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Therapeutic epidural injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Epidural injection of anesthetic substance, diagnostic, caudal, continuous | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 5 | 
| Other specified therapeutic spinal puncture | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Therapeutic spinal puncture NOS | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified diagnostic spinal puncture | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Diagnostic spinal puncture NOS | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Other specified therapeutic epidural injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Therapeutic epidural injection NOS | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Therapeutic lumbar epidural injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Therapeutic sacral epidural injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Therapeutic thoracic epidural injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Therapeutic cervical epidural injection | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Epidural anesthetic NEC | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Epidural injection of neurolytic solution, lumbar | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Local anesthetic lumbar epidural block | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Local anesthetic sacral epidural block | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of chemotherapeutic agent | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of antibiotic | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of local anesthetic agent | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Intrathecal injection of radiological dye | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of anesthetic substance, therapeutic, subarachnoid, differential | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subarachnoid, continuous | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection procedure for myelography, spinal | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subdural, differential | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of anesthetic substance, therapeutic, subdural, continuous | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, diagnostic, subarachnoid, continuous | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of destructive substance into cerebrospinal fluid | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of therapeutic substance into cerebrospinal fluid | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Administration of drug or medicament via epidural route | Procedure site | False | Entire spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 |