What is absence of the seminal vesicles?
Very rarely the seminal vesicles do not develop. This problem usually occurs with congenital absence of the vas deferens. The prostate and seminal vesicles provide about 90 per cent of the fluid in the ejaculate, so absence of the seminal vesicles can cause a smaller amount of ejaculate (usually about 0.5 ml, normal men > 2 ml). The seminal vesicles also contribute to making the ejaculate alkaline, so when they are absent the acidity of the ejaculate is increased.
