Structure of Male Reproductive System — Core Principles
Core Principles
The male reproductive system is responsible for producing sperm and male hormones. It consists of primary sex organs, accessory ducts, accessory glands, and external genitalia. The testes, located in the scrotum (for temperature regulation), are the primary organs, producing sperm in seminiferous tubules and testosterone from Leydig cells.
Sertoli cells nourish developing sperm. Sperm mature and are stored in the epididymis, then travel through the vas deferens, which joins with the seminal vesicle duct to form the ejaculatory duct.
This duct opens into the urethra, a common pathway for urine and semen.
Accessory glands – seminal vesicles, prostate, and bulbourethral glands – secrete seminal plasma, providing nutrients (fructose, citrate), alkalinity, and enzymes crucial for sperm viability and transport. The penis is the copulatory organ, containing erectile tissues (corpora cavernosa, corpus spongiosum) for erection. The entire system is hormonally regulated by the hypothalamus, pituitary, and testes, ensuring continuous sperm production and maintenance of male characteristics.
Important Differences
vs Seminiferous Tubule vs. Epididymis
| Aspect | This Topic | Seminiferous Tubule vs. Epididymis |
|---|---|---|
| Primary Function | Site of spermatogenesis (sperm production). | Site of sperm maturation (acquiring motility and fertilizing capacity) and storage. |
| Cell Types Present | Spermatogonia (germ cells) and Sertoli cells (support cells). Leydig cells are in interstitial spaces outside. | Mainly epithelial cells lining the duct, with some smooth muscle for peristalsis. Contains mature and maturing sperm. |
| Sperm State | Immature, non-motile, non-fertilizing sperm. | Maturing and mature, motile, fertilizing sperm. |
| Location | Within the testicular lobules, highly coiled. | Coiled tube on the posterior surface of the testis. |