Sertoli Cells
செர்டோலி செல்கள்
Sertoli cells are not mere support staff; they are the gatekeepers of spermatogenesis. If these cells fail to form the Blood-Testis Barrier, your own immune system will destroy your developing sperm. Remember this: no Sertoli cells, no viable gametes.
The idea
Sertoli cells line the inner epithelium of the seminiferous tubules. Their primary function is to provide nutrition to the developing germ cells. They are regulated by the Follicle Stimulating Hormone (FSH) secreted by the anterior pituitary. They also provide structural support and phagocytose excess cytoplasm during spermiogenesis.
Why it matters
To support and nourish developing sperm cells during the complex process of spermatogenesis.
NEET lens
NEET focuses on the regulatory axis: FSH acts on Sertoli cells, while LH acts on Leydig cells. Do not confuse the two. Questions often test the 'nutrition' aspect or the hormonal control mechanism. Memorize the FSH-Sertoli link as a high-yield fact for the Human Reproduction unit.
Clinical significance
Sertoli cell dysfunction leads to Sertoli Cell-Only Syndrome (SCOS), where the seminiferous tubules lack germ cells entirely. This results in azoospermia and permanent male infertility. Without these cells, the protective environment required for spermatogenesis is lost.
Introduction
Sertoli cells are large, columnar cells lining the seminiferous tubules that support and nourish developing spermatogenic cells, form the blood-testis barrier, and produce hormones (inhibin, ABP, AMH) in response to FSH.
Core concept
Location: seminiferous tubule epithelium (somatic cells, not germline). Stimulation: FSH from anterior pituitary. Functions: (1) Structural support: developing spermatogenic cells (from base to lumen) nest within Sertoli cell cytoplasm. (2) Nourishment: provide nutrients, growth factors, lactate to developing sperm. (3) Blood-testis barrier (BTB): tight junctions between adjacent Sertoli cells → separate basal (spermatogonia) from adluminal compartment (spermatocytes, spermatids) → immunological protection. (4) Phagocytosis: engulf residual bodies and degenerated germ cells. (5) Hormone production: ABP (concentrates testosterone for spermatogenesis), inhibin (inhibits FSH), AMH (anti-Müllerian hormone — causes regression of Müllerian ducts in male fetus). (6) Spermiation: release mature spermatids into lumen.
Go deeper
AMH (Anti-Müllerian Hormone): produced by fetal Sertoli cells → causes regression of Müllerian ducts (which would become uterus/fallopian tubes in females). Without AMH → Persistent Müllerian Duct Syndrome (male with uterus/tubes). AMH test used clinically to assess ovarian reserve in females (produced by granulosa cells in females) and to diagnose disorders of sex development.
From Class 10
Developing sperm cells need support and nourishment as they mature inside the seminiferous tubules. Sertoli cells provide this support.