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Infertility in Males

Infertility in Males

Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...

Fertilization

Fertilization

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...

Spermatogenesis

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...

Sperm Transport

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...

Sperm Structure and Semen Composition

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...

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Related Experiment Video

Updated: Jul 13, 2026

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

Published on: November 29, 2018

Is sperm evaluation useful in predicting human fertility?

Sheena E M Lewis¹

¹School of Medicine, Obstetrics and Gynaecology, Queen's University Belfast, Institute of Clinical Science, Grosvenor Road, Belfast BT12 6BA, UK. s.e.lewis@qub.ac.uk

Reproduction (Cambridge, England)

|July 21, 2007

Summary

Traditional male infertility diagnosis using semen quality tests lacks functional insights. New functional sperm tests are needed for accurate fertility prediction, especially with advancements like intracytoplasmic sperm injection (ICSI).

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Last Updated: Jul 13, 2026

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

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Published on: November 29, 2018

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Area of Science:

Reproductive biology
Andrology
Clinical diagnostics

Background:

Male infertility diagnosis traditionally relies on semen quality parameters like sperm concentration, motility, and morphology.
Current diagnostic methods do not adequately assess sperm function, questioning their clinical value in predicting fertility.
The rise of intracytoplasmic sperm injection (ICSI) has diminished the perceived importance of conventional sperm quality tests.

Purpose of the Study:

To highlight the limitations of traditional semen analysis in assessing male fertility.
To emphasize the need for advanced functional sperm tests.
To advocate for the development and clinical adoption of novel diagnostic tools.

Main Methods:

Review of traditional semen analysis techniques.
Discussion of emerging functional sperm tests (e.g., sperm motion analysis, acrosome reaction, DNA integrity).
Analysis of the impact of assisted reproductive technologies like ICSI on diagnostic needs.

Main Results:

Conventional semen parameters (concentration, motility, morphology) do not correlate well with actual sperm function or fertility potential.
Numerous functional sperm tests have been developed, but few are in routine clinical use.
The clinical utility of current diagnostic parameters is questionable for predicting fertility outcomes.

Conclusions:

There is an urgent need for international collaboration to develop and validate clinically relevant molecular and functional sperm tests.
Standardized protocols and established clinical thresholds are essential for the routine adoption of new diagnostic methods.
Improved functional sperm testing is crucial for accurate male infertility diagnosis and effective fertility management.