| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Entire membranous urethra | Is a | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier |  | 
| Foreign body in membranous urethra | Finding site | False | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Prostatomembranous urethrorrhaphy | Procedure site | False | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Urethroplasty, repair of membranous urethra, second stage | Procedure site | False | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Urethroplasty, repair of membranous urethra, first stage | Procedure site | False | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Prostatomembranous urethrorrhaphy | Procedure site - Direct | False | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Urethroplasty, repair of membranous urethra, second stage | Procedure site - Direct | False | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Urethroplasty, repair of membranous urethra, first stage | Procedure site - Direct | False | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Prostatomembranous urethrorrhaphy | Procedure site - Direct | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Urethroplasty, repair of membranous urethra, first stage | Procedure site - Direct | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Foreign body in membranous urethra | Finding site | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Urethroplasty, repair of membranous urethra, second stage | Procedure site - Direct | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Structure of lumen of membranous urethra | Is a | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier |  | 
| Postprocedural membranous urethral stricture | Finding site | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 2 | 
| Postinfective membranous urethral stricture | Finding site | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 2 | 
| Stricture of membranous urethra | Finding site | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 | 
| Traumatic membranous urethral stricture | Finding site | True | Membranous urethra structure | Inferred relationship | Existential restriction modifier | 1 |