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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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Sperm Collection of Differential Quality Using Density Gradient Centrifugation
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Published on: November 29, 2018

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Collective dynamics of sperm cells.

Simon F Schoeller1, William V Holt2, Eric E Keaveny1

  • 1Department of Mathematics, Imperial College London, London SW7 2AZ, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|July 28, 2020
PubMed
Summary
This summary is machine-generated.

Sperm collective dynamics, like trains and bundles, may enhance fertilization. Mechanistic models link individual sperm motion to these group behaviors, aiding fertility assessments in artificial insemination.

Keywords:
biological fluid dynamicscollective dynamicssperm motility

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Area of Science:

  • Biophysics
  • Reproductive Biology
  • Mathematical Biology

Background:

  • Sperm collective dynamics, including trains and bundles, are observed in various species.
  • Wave-like patterns in semen are used to assess fertility for artificial insemination.

Purpose of the Study:

  • To review experimental observations of sperm collective dynamics.
  • To describe mechanistic models linking individual sperm motion to collective behaviors.
  • To explore the impact of collective dynamics on fertility.

Main Methods:

  • Review of experimental observations of sperm group dynamics.
  • Description of mechanistic models integrating individual and collective sperm motion.
  • Analysis of multi-scale modeling challenges.

Main Results:

  • Sperm group dynamics can facilitate and potentially enhance sperm's journey to the egg.
  • Mechanistic models successfully link individual sperm flagellar motion to observed collective dynamics.
  • Models address disparate time- and length scales to capture emergent behaviors.

Conclusions:

  • Collective sperm dynamics play a significant role in reproductive processes.
  • Understanding these dynamics is crucial for improving fertility assessments and artificial insemination techniques.
  • Further research is needed to fully elucidate the impact of collective dynamics on fertility.