noun, plural: urethrae or urethras
The urethra is a tube that conveys urine from the urinary bladder to the outside. It is a duct that connects the urinary bladder to the urethral opening (called urinary meatus). In most mammals, it serves as a duct or canal through which urine is discharged.
In males, it is about 25 centimetres. It is longer than that in the females (i.e. ranging from 4.8 cm to 5.1 cm). It travels through the penis. Aside from discharging urine, the urethra also serves as the male genital duct that discharges the semen. Aside from the external urethral sphincter that helps in voluntary control in urination, there is an additional sphincter muscle in males called the internal urethral sphincter.
Word origin: Latin ūrēthra, Greek ourēthra, ourein (to urinate)
- Male urethra
- Female urethra
- Spongy part of the male urethra
- Spongy urethra
- Glands of the female urethra
- Glands of the male urethra
- Penile urethra
- External opening of urethra
- Navicular fossa of urethra
- urethral (adjective, of, or pertaining to, urethra)