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  1. HRC Anonymous User
  2. Infertility Discussion
  3. Sunday, 03 March 2013
  4.  Subscribe via email
Hi I was reading a couple articles on the internet after googling "rapid sperm transport. In particular,

The dynamics of rapid sperm transport through the female genital tract: evidence from vaginal sonography of uterine peristalsis and hysterosalpingoscintigraphy


This article indicates that sperm from the cervical region gets to the entrance to the fallopian tubes within one minute or within minutes due to constant uterus contractions etc.

But, why is there only a few hundred sperm at the site of insemination, would you not expect there to be greater numbers of sperm at the fallopian tubes given the articles findings?

Mortimer indicated that these rapidly transported sperm would likely be non-viable; however, wouldn't they be the best of the best as they were ejaculated in the first portion of the semen?

Sorry for the technical questions, but it doesn't make sense. BC
Responses (3)
DrFrederick Accepted Answer Pending Moderation
Dear BC: there is a large amount of sperm lost from the time of intercourse, until the connection to the fallopian tube where the egg is located. This loss is due to various reasons, some related to the abnormal sperm shapes and slow swimmers that can interfere with the good sperm that is trying to propel forward. This loss can also be due to the anatomy of the cervical passageway, with a myriad of glands and mucous that can trap the sperm or be a hostile environment. This explains why it is important to have good sperm numbers on a semen analysis prior to conception.

Sincerely,
Dr. Jane Frederick
  1. more than a month ago
  2. Infertility Discussion
  3. # 1
HRC Anonymous User Accepted Answer Pending Moderation
Hi Dr. - The reason for my question is to make sense of conflicting information eg. few hundred sperm at site of fertilization, despite viability of rapid transport of sperm within a few minutes, according to this article.

Why would there not be more sperm at the fallopian tubes given this article's findings, which also finds that the cervical mucus plays no role in rapid sperm transport

Eg. it mentions that even early in the cycle there was rapid sperm transport despite the cervical mucus being less fluid and that their theory is that the uterus contractions are the source of the propulsion as the sperm would not be able to make its way to the upper uterus that quickly under their own power.
  1. more than a month ago
  2. Infertility Discussion
  3. # 2
DrFrederick Accepted Answer Pending Moderation
Dear BC: the cervical mucous is usually unhelpful in propelling tiny sperm due to its viscous nature. Uterine contractions propelling the sperm is theoretical; if you look at the anatomy of the sperm tail you will realize why it has the ability to propel to the egg. I hope this helps you.

Best,
Dr. Jane Frederick
  1. more than a month ago
  2. Infertility Discussion
  3. # 3
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