Seminal vesicles and baldder neck

A description of the prostate anatomy would be seriously incomplete without a mentioning the deferential ampullas, the seminal vesicles and the bladder neck. Although they are not a part of the prostate, these organs play an essential role in its functioning.

The deferential ampullas contain the sperm produced by the testicles.

The seminal vesicles, as the name suggests, are two small, internally pluriseptate sacs (mean diameter 5×4 cm) which only help in the physiological semen chemical composition. The strong pelvic muscles contraction during orgasm, force the semen into the ejaculatory ducts which join the urethra, where it is mixed with the prostatic fluid secreted by the acini, before being ejaculated.

The bladder neck is the area at the base of the bladder which opens into a funnel during micturition to allow urine to flow along the lines of less resistance, in the proximal urethra. The urethra distends when urine is passing and when is pulled by specific extra-urethral muscles.

From the above description we can now provide an answer to a common question:
“What is the prostate for?”
The prostate function is to produce and store in its glandular acini the prostatic fluid, , for nourishing the spermatozoa in the sperm, which is stored in the deferential ampullas. During orgasm the pelvic muscles force both prostatic fluid and sperm into the urethra at the same time. There they are mixed and ejaculated.