Links with many details:
Some highlights:
- Length (average, male): 22 cm
- Diameter: I guess it stretches? For reference, a ureteroscope like this is about 2.8mm in diameter. A urinary catheter ranges from 4.62mm or 5.28mm
- Cross section and number of cells
- Male urethral cancers account for less than 1% of urologic malignancies
- Internal and external sphincters
Distal (furthest from the body) output orifice (the point where urine exits the urethra): Urinary meatus
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