The vas deferens, which start at the tail of the epididymes, end at the ampulla, seen here. They join the seminal vesicles, seen here in pink, and together enter the prostate, in yellow. At this great merger, the sperm that are present in high concentration in the ampulla, pick up essential nutrients from both prostate and seminal vesicles. The health of all e structures is critical to male fertility.
The testis produce sperm. The sperm mature in the epididymes. The vasa deferentia are muscular structures that transmit them to the ejaculatory ducts (not shown). The seminal vesicles produce proteins important for sperm function.
1: Smoking--causes blood vessel damage
2: Obesity--cause hormonal problems, diabetes, and blood vessel damage
3: Lack of exercise--causes obesity and all of the above
4: Chronic stress--all of the above
5: Poor sleep habits--all the above
If you value your erections, perhaps try some lifestyle modification.
Most men are 46 XY. Rarely--or perhaps not so rarely--one out of 1000 baby boys have an extra-X chromosome. Their karyotypes, as seen above, are 47XXY.
These boys, most often, have totally normal appearances and grow up to be totally healthy men with normal male characteristics. Their only abnormalities are that they have very small testicles that do not produce sperm. These men are infertile.
While in the past these men were considered hopelessly infertile, now, due to advances in sperm detection procedures, fertility preservation, and assisted reproductive technologies, some of these men can now father their own biological children.
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