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Related Concept Videos

Disorders of the Male Reproductive System01:20

Disorders of the Male Reproductive System

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Men's health issues are increasingly recognized as significant, with several conditions posing common threats. Among these, testicular cancer is especially prevalent in younger men, particularly those aged 20 to 35 years. The disease often manifests as a painless mass in the testicles, sometimes accompanied by a sensation of heaviness or a dull ache.
Prostate disorders are another major concern. These conditions can impair urinary flow due to the prostate's location around the urethra....
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Infertility in Males01:23

Infertility in Males

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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...
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Testes: Histology01:27

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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.
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Testes: Gross Anatomy01:19

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The testes, also known as testicles, are the male gonads. They are housed within the scrotum, a sac-like structure located beneath the penis. The scrotum's primary role is to regulate the temperature of the testes, which is crucial for sperm production.
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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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Testosterone: Functions and Regulation01:26

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The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...
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Related Experiment Video

Updated: Aug 7, 2025

Isolation of Sertoli Cells and Peritubular Cells from Rat Testes
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Testicular Regression Syndrome: Two Case Studies.

Lamiaa Elazizi1, Zineb Elazime1, Fatima-Zahra Lahmamssi1

  • 1Department of Endocrinology, Diabetology, Metabolic Diseases and Nutrition, Hassan II University Hospital Center, Fez, MAR.

Cureus
|March 13, 2023
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Summary

Testicular agenesis, or testicular regression syndrome (TRS), is a rare condition where no testicular tissue is present in individuals with a 46,XY karyotype. Diagnosis involves hormonal tests and imaging, with androgen therapy recommended.

Keywords:
amhkaryotypelaparoscopytesticular agenesistesticular regression

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Area of Science:

  • Reproductive Endocrinology
  • Pediatric Urology
  • Genetics

Background:

  • Testicular agenesis, also known as testicular regression syndrome (TRS), is a rare condition characterized by the complete absence of testicular tissue in individuals with a 46,XY karyotype.
  • The clinical presentation of TRS can vary significantly, depending on the timing of gonadal regression during fetal development.

Observation:

  • This report details two cases initially diagnosed with cryptorchidism and bilateral impalpable testes.
  • Hormonal evaluation revealed undetectable anti-Müllerian hormone (AMH) levels and elevated gonadotropins.
  • Radiological imaging failed to locate the testes, and subsequent laparoscopy confirmed their absence, establishing the diagnosis of TRS.

Findings:

  • The study highlights the diagnostic process for testicular agenesis, emphasizing the utility of hormonal assays and imaging.
  • Confirmation of TRS was achieved through negative findings in radiological exploration and laparoscopy.

Implications:

  • Early and accurate diagnosis of testicular agenesis is crucial for appropriate management.
  • Androgen replacement therapy and psychological support are recommended for patients diagnosed with TRS to address potential developmental and psychological impacts.