Urethrae
Urethrae are the plural form of urethra, the duct that conducts urine from the bladder to the exterior in humans and many other animals. The term is used in anatomical and comparative contexts to discuss multiple instances of the channel within a single organism or across species.
In humans, urethrae differ by sex. The male urethra is roughly 18 to 20 cm long and
Function and lining: The urethra carries urine from the bladder to the outside, and in males also
Clinical relevance: Common issues include urethral stricture (narrowing due to injury or inflammation), urethritis (inflammation usually
Development and variation: Urethral development involves the urogenital sinus; the male urethra has contributions from endoderm