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Award-winning urologist - and pioneer in Men's Health - Dr. Paul Turek blogs weekly about issues such as infertility, vasectomy and vasectomy reversal, sexual and hormonal dysfunction and more. Keep up with the latest on this fascinating field of medicine.

A Day in the Life of the Epididymis

epididymal anatomy in the human
Epididymis: most of the colored section of the figure (A-C) and one of the most important tubes in your body. (Courtesy: Wikipedia.org)

The epididymis has been on my mind recently. The Epi-WHAT-amus? What is that? Well, for one, it’s probably the shortest 5-syllable word you’ve ever heard. And, it happens to be the name of an organ that can spell the difference between being a fertile or infertile guy.

Anatomy First

The epididymis is an 18-foot long, tightly coiled, almost microscopic, sperm-filled tubule that could fit into a pen cap. It sits on top of, and wraps behind, the testicle. Sperm pass from the testicle into the epididymis and, over about 12 days, get rubbed, shined and gassed up for the big day.

At the end of this trip, sperm are ready to fly, prepared to meet an egg, anywhere, anytime. However, until ejaculation occurs, some 200 million sperm are kept in check within the epididymis just waiting to be set free.

Sperm Maturation

Sounds funny, but passage of sperm through the epididymis is a lot like going through puberty. A lot of serious functionality is acquired during this time that prepares sperm for the real world. Here is a short list of what happens to sperm in the epididymis:

  • Improved structural rigidity that helps with motility or movement.
  • Acquire the ability to move purposefully.
  • Learn to “smell” (chemosense) the fluid released during female ovulation. This helps them know where to go once ejaculated.
  • Acquire the ability to fertilize eggs.

The epididymis is also a “filter” that sorts out and destroys sperm that, for some biological reason, do not pass muster. This activity is increased several hundred-fold after a vasectomy when sperm fills the epididymis with nowhere else to go because of the downstream roadblock.

So, much like the inconspicuous, nerdy guy in the back of the class, the epididymis, in its own quiet way, is critical for normal male fertility. Beware though, that it can also be a problem child. Here’s how:

Epididymis as Elephant

Here’s why I have been thinking epididymal thoughts. Based on my recently published research on how ejaculated sperm recovers following reversal of vasectomy, I am now convinced that the epididymis plays a key role. Although sperm counts are similar after reversal of younger and older (>15 years) vasectomies, sperm motility is significantly lower after reversal of older vasectomies. And lower motility means longer time to pregnancy or even frank infertility after reversal. Given what you now know about how the normal epididymis influences sperm, you may surmise that it is the elephant in the room when it comes to impaired sperm movement after vasectomy reversal.  If I can now figure out a way to help the epididymis get its mojo back after reversal, then I am pretty sure that natural fertility rates will improve as well. After all, if more sperm were given directions, maybe fewer would be needed to get the job done!

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15 Responses to “A Day in the Life of the Epididymis”

    • Paul Turek, MD Paul Turek, MD

      Dear Chyke, I have many patients like you. Read, read and read. Call if you need to talk with us. But always have some hope.

  1. Peter

    Hi,am from Kenya been reading your blogs and going through your website and i know your the person i need to see.i underwent a hernia operation in 2005 and a few months later i discovered i could not produce sperm which i could produce before the surgery.i have visited several doctors here in Kenya to no avail ,just wondering if you can visit Kenya for men like me and many others who really need your expertise. I Will be happy to hear from you. Regards Kanyote.

    • Paul Turek, MD Paul Turek, MD

      Dear Peter/Kanyote: I would love to visit Kenya, but I am not licensed to practice medicine there. I have spent a good deal of time in Senegal but way back when I was training in medicine. Consider a Second Opinion consult as you may have obstructive azoospermia due to mesh hernia repair.

  2. Derick L Corea

    Paul Turek, MD

    I have been suffering for too long now with epididymis and a hernia it is driving me crazy I went to a Doctor In Puerto Rico I got no treatment. I’m on Dialysis I live in the British Virgin Islands. Can’t take this pain any longer.

  3. Krishna

    I have been diagnosed by azoospermia. Testical biopsy done and both producing normal sperms. Specialist suspected it might be blockage and suggest for ICSI/IVF. But I’m not satisfy and I want to solve the “root cause” of this problem. Can you please advise? Thank you.

    • Paul Turek, MD Paul Turek, MD

      Dear Krishna, I like the way that you are thinking! There are actually 2 possible solutions to your problem: IVF-ICSI with surgically retrieved sperm and potential reconstruction of the system to have kids naturally. I just did two such similar cases this past month and 1 patient already has ejaculated sperm after surgery! These are challenging microsurgical cases that I enjoy immensely. The reason why the “rebuild it” approach wasn’t discussed with you is possibly because the doctors don’t do this kind of surgery? Consider a Second Opinion with us to see what’s possible.

  4. Donnie

    I had Inguinal Hernia surgery about 10 days ago. Immediately after the selurgery I noticed seemed like thr Hernia but was harder and sensitive manipulation. I had a follow up with my Surgen and he explained that my hernia was pretty big (especially for a 29 yr old) and that swelling of the spermatic tube and epididymis is common post surgery. the whole area is still sensitive and the spermatic tube is swollen along with the epididymis being swollen.. Is this a normal thing post surgery? I hate the thought of this not going back to normal

    • Paul Turek, MD Paul Turek, MD

      Dear Donnie, really hard to make a diagnosis over the web. Stay in touch with your surgeon and gives things a bit more time to settle down.

  5. JP

    I had a vasectomy performed 4 years ago. Over the past 10 months I have had recurrent bouts of epididymitis. Mainly on my left side X 4 but I have had 2 bouts on my right. The discomfort is accompanied with specific swelling of the inferior portion of the structure. It improves with antibiotics/warm baths/NSAIDS/support. There is no referred testicular pain. Do you recommend an epididymectomy or a reversal of the vasectomy? What is the success rate of both? Thank you.

    • Paul Turek, MD Paul Turek, MD

      Dear JP, sounds like recurrent inflammation (epididymitis without infection). This should subside with time, but you have given it time. Epididymectomy will work if one is certain that the inflammation is epididymal in nature, but won’t if its not. Reversal is restorative and should eliminate it but then there’s the worry about contraceptive all over again. A trial of testosterone hormone replacement for 6 mos is another option, as it may “turn off” sperm production and reduce inflammation.

  6. Neil

    Since having my vasectomy 5 years ago I been having reacurring epididymitis, which my gp gives me some pills to reduce it, but it never really goes away, last year I saw a new gp explained the symptoms with some mild pain in the lower back and he thought it was gulliuns barre and gave me a drug overdose which landed my in resuss and a few nights in hospital still the epididymitis not sorted. I now suffer from seizures but still got epididymitis would a reversal at least get rid of the epididymitis?

    • Paul Turek, MD Paul Turek, MD

      Dear Neil, Vasectomies can be associated with epididymitis which is typically “inflammatory” due to a “blowout” in the epididymis and is treated with antinflammatories. Antibiotics are unlikely to help much as this is not a true “infection.” However, usually epididymitis occurs once or twice and then stops. Another diagnosis is epididymal congestion or post-vasectomy pain syndrome, which is simpler and due to excessive pressure behind the vasectomy. It typically is not associated with swelling, unlike inflammatory epididymitis. A vasectomy reversal is more likely to help stop congestive pain more than epididymitis, but can be used for both.


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