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Related Concept Videos

Sperm Structure and Semen Composition01:22

Sperm Structure and Semen Composition

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...
Spermatogenesis01:41

Spermatogenesis

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 reproductive...
Spermatogenesis01:22

Spermatogenesis

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.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
Sperm Transport01:15

Sperm Transport

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.
The maturation phase occurs in the epididymis, where sperm...
Urine Studies I: Urinalysis01:29

Urine Studies I: Urinalysis

Urinalysis is a widely used diagnostic test that analyzes urine's physical, chemical, and microscopic characteristics. Healthcare providers use it to detect and monitor various health conditions, including renal disease, urinary tract infections (UTIs), diabetes, and metabolic or systemic disorders.Components of UrinalysisUrinalysis consists of three primary components: physical, chemical, and microscopic examination. Each provides unique insights into the urine sample and, by extension, the...
Testes: Histology01:27

Testes: Histology

A tough, fibrous membrane, the tunica albuginea, covers the testes, extending inward to form fibrous partitions or septa, dividing them into internal compartments called lobules. Each lobule has 1 to 3 tightly coiled seminiferous tubules where sperm production occurs. These tubules merge into a tubular network at the back of the testis, known as the rete testis. It connects to 15 to 20 efferent ductules, leading to the epididymis.
The spermatogenic cells, responsible for producing sperm, are...

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Related Experiment Video

Updated: Jul 7, 2026

The Examination of Peroxidase-Positive Leukocytes in Semen
04:36

The Examination of Peroxidase-Positive Leukocytes in Semen

Published on: January 19, 2024

[The information contained in a semen analysis].

Lars Björndahl1, Trine B Haugen

  • 1Centrum för Andrologi och Sexualmedicin, Kliniken för Endokrinologi, Karolinska Universitetssjukhuset, Huddinge.

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke
|February 12, 2008
PubMed
Summary
This summary is machine-generated.

Predicting male fertility remains challenging, as current semen analysis methods, largely unchanged since the 1950s, lack standardization and reliability for accurate fertility prediction.

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Collection of Post-mating Semen from the Female Reproductive Tract and Measurement of Semen Liquefaction in Mice

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Last Updated: Jul 7, 2026

The Examination of Peroxidase-Positive Leukocytes in Semen
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Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects
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Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects

Published on: April 21, 2022

Collection of Post-mating Semen from the Female Reproductive Tract and Measurement of Semen Liquefaction in Mice
12:06

Collection of Post-mating Semen from the Female Reproductive Tract and Measurement of Semen Liquefaction in Mice

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Area of Science:

  • Andrology
  • Reproductive Medicine
  • Clinical Laboratory Science

Context:

  • Semen analysis is a cornerstone of infertility investigations.
  • The predictive value of semen analysis for male fertility is debated.
  • Current methodologies often lack standardization and evidence-based validation.

Purpose:

  • To review the current state of semen analysis in predicting male fertility.
  • To highlight the need for standardized, evidence-based methodologies.
  • To emphasize the interpretation of semen analysis results in clinical context.

Summary:

  • No simple, reliable method currently exists to predict male fertility.
  • Many laboratories utilize outdated semen analysis techniques from the 1950s.
  • Sperm concentration, motility, and morphology show correlations with time to pregnancy.
  • Interpreting semen analysis requires patient history and other investigations for a comprehensive diagnosis.

Impact:

  • Highlights the limitations of current semen analysis for fertility prediction.
  • Underscores the critical need for standardized and evidence-based laboratory practices.
  • Emphasizes the importance of integrating semen analysis with other clinical data for accurate male infertility assessment.