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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

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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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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
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Sperm Transport01:15

Sperm Transport

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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
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Microtubules in Cell Motility01:24

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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
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Sperm Structure and Semen Composition01:22

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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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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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Related Experiment Video

Updated: Nov 1, 2025

Recording Electrical Currents across the Plasma Membrane of Mammalian Sperm Cells
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A dynamic basal complex modulates mammalian sperm movement.

Sushil Khanal1, Miguel Ricardo Leung2,3, Abigail Royfman1

  • 1Department of Biological Sciences, University of Toledo, Toledo, OH, USA.

Nature Communications
|June 22, 2021
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Summary
This summary is machine-generated.

Sperm

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Related Experiment Videos

Last Updated: Nov 1, 2025

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Area of Science:

  • Sperm biology and reproductive mechanics.

Background:

  • Efficient sperm motility is crucial for reproductive success.
  • Microtubule sliding, driven by axonemal dynein, powers sperm movement.
  • Centriole rigidity was thought to prevent microtubule sliding at the sperm base.

Purpose of the Study:

  • To investigate microtubule sliding at the base of mammalian sperm.
  • To understand the role of the distal centriole (DC) and pericentriolar matrix in sperm function.
  • To elucidate the mechanism coupling sperm tail beating with head movement.

Main Methods:

  • High-resolution imaging and biophysical analysis of mammalian sperm.
  • Investigating the structure and dynamics of the distal centriole and pericentriolar matrix.
  • Observing and quantifying microtubule and centriole deformations during sperm movement.

Main Results:

  • Mammalian sperm possess a dynamic basal complex (DBC) involving the distal centriole (DC).
  • The DBC facilitates internal sliding deformations, coupling tail beating with head kinking.
  • Asymmetric sliding within the DC (~300 nm) causes the sperm head to tilt and kink.

Conclusions:

  • The dynamic basal complex (DBC) enables coordinated head and tail movement in sperm.
  • This mechanism suggests an evolved solution for efficient sperm propulsion and fertilization.
  • The findings challenge previous assumptions about centriole rigidity and sperm mechanics.