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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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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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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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Development of the Sexual Organs in the Embryo and Fetus01:15

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Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
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Sperm Transport01:15

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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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What is Meiosis?01:34

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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Related Experiment Video

Updated: Oct 22, 2025

Isolation of Sertoli Cells and Peritubular Cells from Rat Testes
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Leydig Cell and Spermatogenesis.

Ren-Shan Ge1, Xiaoheng Li2, Yiyan Wang2

  • 1The Second Affiliated Hospital and Yuying Children's Hospital, Wenzhou Medical University, Wenzhou, China. r_ge@yahoo.com.

Advances in Experimental Medicine and Biology
|August 28, 2021
PubMed
Summary
This summary is machine-generated.

Leydig cells synthesize testosterone, crucial for sperm production. This process involves specific enzymes and androgen transport to Sertoli cells for regulating spermatogenesis.

Keywords:
Androgen receptorLeydig cellsSertoli cellsSpermatogenesisSynthetic enzymesTestosterone

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Area of Science:

  • Reproductive Biology
  • Endocrinology
  • Cell Biology

Background:

  • Leydig cells in the testis synthesize androgens, primarily testosterone, from cholesterol.
  • Testosterone produced by adult Leydig cells is essential for spermatogenesis.
  • Testosterone synthesis requires at least four key steroidogenic enzymes.

Purpose of the Study:

  • To outline the key enzymes and cellular processes involved in testicular androgen synthesis.
  • To describe the role of Leydig cells and associated enzymes in testosterone production.
  • To explain the transport and mechanism of androgen action in regulating spermatogenesis.

Main Methods:

  • Review of literature on steroidogenesis and male reproductive physiology.
  • Identification of key enzymes in the testosterone synthesis pathway.
  • Description of androgen transport and receptor-mediated regulation.

Main Results:

  • Testosterone synthesis involves cytochrome P450 cholesterol side chain cleavage enzyme, 3β-hydroxysteroid dehydrogenase, cytochrome P450 17α-hydroxylase/17,20-lyase, and 17β-hydroxysteroid dehydrogenase isoform 3.
  • Precursor Leydig cells express testosterone metabolic enzymes: steroid 5α-reductase 1 and 3α-hydroxysteroid dehydrogenase.
  • Androgen-binding protein transports androgen to Sertoli cells, where androgen receptor binding regulates spermatogenesis.

Conclusions:

  • Leydig cells are the primary site of testosterone synthesis, vital for male fertility.
  • A specific set of steroidogenic enzymes orchestrates testosterone production.
  • The androgen-mediated regulation of spermatogenesis involves intercellular transport and receptor interaction.