## AMH Production in Spermatogenesis **Key Point:** Sertoli cells are the exclusive source of anti-müllerian hormone (AMH) in the testis, beginning from fetal life and continuing throughout the reproductive years. ### Role of Sertoli Cells Sertoli cells are the primary somatic cells of the seminiferous epithelium and perform multiple critical functions: 1. **AMH secretion** — begins during fetal development and persists until senescence 2. **Nutritional support** — provide metabolic substrates to developing germ cells 3. **Tight junction formation** — establish the blood-testis barrier 4. **FSH responsiveness** — express FSH receptors and regulate spermatogenesis ### Clinical Significance of AMH **High-Yield:** AMH levels are used clinically to: - Assess testicular reserve and spermatogenic function - Diagnose disorders of sex development (DSD) - Predict response to assisted reproductive techniques - Evaluate azoospermia (low/absent AMH suggests primary testicular failure) ### Comparison of Testicular Cell Types | Cell Type | Primary Function | Hormone Production | |-----------|------------------|--------------------| | Sertoli cells | Germ cell support, barrier function | AMH, Inhibin B | | Leydig cells | Steroid synthesis | Testosterone, DHEA | | Spermatogonia | Germ cell precursors | None | | Spermatocytes | Meiotic division | None | **Clinical Pearl:** In prepubertal boys, elevated AMH levels reflect normal Sertoli cell function; declining AMH with age correlates with reduced spermatogenic reserve. [cite:Guyton & Hall 14e Ch 80]
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