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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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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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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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Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
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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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Related Experiment Video

Updated: Nov 7, 2025

Isolation of Sertoli Cells and Peritubular Cells from Rat Testes
11:11

Isolation of Sertoli Cells and Peritubular Cells from Rat Testes

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Sleep and the Testis.

Nora A O'Byrne1, Fiona Yuen1, Warda Niaz1

  • 1The Lundquist Institute at Harbor-UCLA Medical Center, Torrance, CA.

Current Opinion in Endocrine and Metabolic Research
|May 3, 2021
PubMed
Summary
This summary is machine-generated.

Disordered sleep negatively impacts male reproductive health, reducing sperm count and testosterone levels. Addressing sleep issues may improve andrological conditions like erectile dysfunction.

Keywords:
AndrogenCircadianFertilitySleepSleep Disordered Breathing

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Area of Science:

  • Andrology
  • Sleep Medicine
  • Men's Health

Background:

  • Disordered sleep is linked to impaired neurocognition and metabolic health.
  • The relationship between sleep disturbances and andrological health is an emerging area of research.

Purpose of the Study:

  • To review the current evidence on the association between sleep problems and male reproductive health.
  • To explore the impact of insufficient, misaligned, and disrupted sleep on andrological parameters.

Main Methods:

  • Review of high-quality cohort and interventional studies.
  • Analysis of data from studies on sleep restriction, shift work, and obstructive sleep apnea (OSA).

Main Results:

  • Reduced sperm count observed in men with sleep disturbances.
  • Sleep restriction leads to decreased testosterone levels.
  • Obstructive sleep apnea (OSA) is associated with lower testosterone and erectile dysfunction, which improves with OSA treatment.

Conclusions:

  • Sleep disturbances negatively affect sperm count and testosterone levels.
  • Improving sleep may be beneficial for andrological health and potentially mitigate age-related illnesses in men.