It continuously makes its way into the mouth through small ducts that originate within the salivary glands and course under the skin, opening directly into the oral cavity. (animalplanet.com)
When not used for breeding, small ducts in the prostate deposit fluids produced there into the urethra to be expelled in urine. (professorshouse.com)
The ports have drawstrings to adjust for smaller ducts and cords without leaking light. (geekwrapped.com)