| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Local anesthetic cervical intrathecal block | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Local anesthetic thoracic intrathecal block | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Local anesthetic lumbar intrathecal block | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Saddle block | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-ureteral shunt | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Spinal anesthesia | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Other specified spinal anesthetic | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Spinal anesthetic NOS | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Local anesthetic cervical intrathecal block | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Local anesthetic thoracic intrathecal block | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Local anesthetic lumbar intrathecal block | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Saddle block | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Spinal anesthesia | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Other specified spinal anesthetic | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Spinal anesthetic NOS | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Entire spinal subarachnoid space | Is a | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Structure of cervical subarachnoid space | Is a | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Structure of dorsal subarachnoid space | Is a | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Structure of sacral subarachnoid space | Is a | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Structure of lumbar subarachnoid space | Is a | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier |  | 
| Creation of thecoperitoneal shunt | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of connection from spinal subarachnoid space | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of thecopleural shunt | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of syringosubarachnoid shunt | Procedure site - Indirect | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Renewal of spinal subarachnoid shunt | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of spinal subarachnoid shunt | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Cerebrospinal fluid collection | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Intrathecal injection of local anesthetic agent | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal injection of radiological dye | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Intrathecal neurolytic injection | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Intrathecal neurolysis of sacral roots | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Intradural spinal arachnoid cyst | Finding site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Traumatic spinal subarachnoid hemorrhage | Finding site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| External drainage procedure from spinal subarachnoid space | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Intrathecal confirmation technique | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subarachnoid, differential | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Spinal pleurothecal shunt with valve | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Spinal salpingothecal shunt with valve | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid-peritoneal spinal shunt | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-peritoneal shunt | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of anesthetic substance, therapeutic, subarachnoid, continuous | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-ureteral shunt | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of lumbosubarachnoid shunt | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Injection of anesthetic substance, therapeutic, subdural, differential | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of subarachnoid-peritoneal shunt | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subdural, continuous | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of subarachnoid-ureteral shunt | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of subarachnoid-ureteral shunt | Procedure site | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of anesthetic substance, diagnostic, subarachnoid, continuous | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of destructive substance into cerebrospinal fluid | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of therapeutic substance into cerebrospinal fluid | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified therapeutic spinal puncture | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Therapeutic spinal puncture NOS | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified diagnostic spinal puncture | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Diagnostic spinal puncture NOS | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Other diagnostic lumbar puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of lumbar subcutaneous shunt | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Other specified therapeutic spinal puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Cerebrospinal fluid collection | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Spinal pleurothecal shunt with valve | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 3 | 
| Diagnostic lumbar puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Therapeutic spinal puncture NOS | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified diagnostic spinal puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Diagnostic spinal puncture NOS | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Cervical puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Therapeutic spinal puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Lumbar puncture to lower intracranial pressure | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Lumbar puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| External drainage procedure from spinal subarachnoid space | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of subarachnoid-ureteral shunt | Procedure site - Indirect | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-peritoneal shunt | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of spinal subarachnoid-ureteral shunt | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Spinal pleurothecal shunt with valve | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Lumbar puncture to lower intracranial pressure | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Cerebrospinal fluid collection | Procedure site - Indirect | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of subarachnoid-peritoneal shunt | Procedure site - Indirect | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Renewal of spinal subarachnoid shunt | Procedure site - Indirect | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Therapeutic spinal puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Diagnostic lumbar puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of spinal subarachnoid shunt | Procedure site - Indirect | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of therapeutic substance into cerebrospinal fluid | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of destructive substance into cerebrospinal fluid | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Other diagnostic lumbar puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Other specified diagnostic spinal puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Diagnostic spinal puncture NOS | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Therapeutic spinal puncture NOS | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified therapeutic spinal puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| External drainage procedure from spinal subarachnoid space | Procedure site - Indirect | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Lumbar puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Cervical puncture | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of spinal subarachnoid-peritoneal shunt | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-ureteral shunt | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of lumbosubarachnoid shunt | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of spinal subarachnoid shunt | Procedure site - Direct | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-ureteral shunt | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid-peritoneal shunt | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of spinal subarachnoid shunt | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of connection from spinal subarachnoid space | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of lumbar subcutaneous shunt | Procedure site - Direct | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Collection of cerebrospinal fluid via ventriculoperitoneal shunt | Procedure site - Indirect | False | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 | 
| Collection of cerebrospinal fluid via ventriculoperitoneal shunt | Procedure site - Indirect | True | Structure of spinal subarachnoid space | Inferred relationship | Existential restriction modifier | 2 |