what is the function of the urethral opening
Urethra Females use their urethra only for urinating, but males use their urethra for both urination and ejaculation.[1] The external urethral sphincter is a striated muscle that allows voluntary control over urination.[2] Only in the male is there an additional internal urethral sphincter muscle.[3]
Ejaculatory duct The ejaculatory ducts (ductus ejaculatorii) are paired structures in male anatomy.[1] Each ejaculatory duct is formed by the union of the vas deferens with the duct of the seminal vesicle.[2] They pass through the prostate, and open into the urethra at the seminal colliculus. During ejaculation, semen passes through the prostate gland, enters the urethra and exits the body via the urinary meatus.[3]