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Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)
| Leydig cells | ||
|---|---|---|
| Histological section through testicular parenchyma of a boar. 1 Lumen of convoluted part of the seminiferous tubules, 2 spermatids, 3 spermatocytes, 4 spermatogonia, 5 Sertoli cell, 6 myofibroblasts, 7 Leydig cells, 8 capillaries | ||
| Latin | ' | |
| Gray's | subject #258 1243 | |
| System | ||
| MeSH | [1] | |
| Cross-section of seminiferous tubules. Arrows indicate location of Leydig cells. | ||
Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle. They can secrete testosterone and are often closely related to nerves. Leydig cells have round vesicular nuclei and a granular eosinophilic cytoplasm.
Nomenclature[]
Leydig cells are named after the German anatomist Franz Leydig, who discovered them in 1850.[1]
Functions[]
Leydig cells release a class of hormones called androgens (19-carbon steroids). They secrete testosterone, androstenedione and dehydroepiandrosterone (DHEA), when stimulated by the pituitary hormone luteinizing hormone (LH). LH increases cholesterol desmolase activity (an enzyme associated with the conversion of cholesterol to pregnenolone), leading to testosterone synthesis secretion by Leydig cells.
Follicle-stimulating hormone (FSH) increases the response of Leydig cells to LH by increasing the number of LH receptors expressed on Leydig cells.
Ultrastructure[]
Leydig cells are polygonal, eosinophilic cells with a round vesicular nucleus and contain lipid droplets. They contain abundant smooth endoplasmic reticulum, which accounts for their eosinophilia. Frequently, lipofuscin pigment and rod-shaped crystal-like structures (Reinke's crystals) are found.[2][3]
Development[]
Leydig cells form during the 16th and 20th week of gestation and are quiescent until puberty.
Additional images[]
References[]
- ↑ Who Named It synd/625
- ↑ Al-Agha O, Axiotis C (2007). An in-depth look at Leydig cell tumor of the testis. Arch Pathol Lab Med 131 (2): 311-7.
- ↑ Ramnani, Dharam M. Leydig Cell Tumor : Reinke's Crystalloids. URL accessed on 2007-03-28.
See also[]
- Sertoli cell
- Sertoli-Leydig cell tumour
External links[]
- Histology at Boston University 16907loa
- Reproductive Physiology
- Diagram at umassmed.edu
Male reproductive system
| |
|---|---|
| Scrotum | layers (skin, Dartos, External spermatic fascia, Cremaster, Internal spermatic fascia) • Perineal raphe • Spermatic cord |
| Testes | layers (Tunica vaginalis, Tunica albuginea) • Appendix • Mediastinum • Lobules • Septa • Leydig cell • Sertoli cell • Blood-testis barrier |
| Spermatogenesis | Spermatogonium • Spermatocytogenesis • Spermatocyte • Spermatidogenesis • Spermatid • Spermiogenesis • Spermatozoon |
| seminal tract | Seminiferous tubules (Tubuli seminiferi recti, Rete testis, Efferent ducts) • Epididymis (Appendix) • Vas deferens • Ejaculatory duct Seminal colliculus |
| urinary tract | Internal urethral orifice • Urethra (Prostatic, Intermediate, Spongy) • Urethral crest • Urethral gland • External urethral orifice |
| Penis | Corpus cavernosum • Corpus spongiosum • Navicular fossa of male urethra • Glans penis • Fundiform ligament • Suspensory ligament • Foreskin • Frenulum |
| accessory glands | Seminal vesicles (Excretory duct of seminal gland) • Prostate (Prostatic utricle, Prostatic sinus) • Bulbourethral glands |
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