Male Reproductive System: Anatomy, Spermatogenesis, and Hormonal Regulation

Notes

REPRODUCTION • The Reproductive System 28-1 Chapter 28 Reproductive System 28-2 Anatomy of Male Reproductive System • Scrotum – 2 chambered sac that contains testes; separated by raphe – Dartos and cremaster muscles help regulate temperature • Perineum – Diamond-shaped areas between thighs – Divided into anterior urogenital triangle (penis and scrotum) and posterior anal triangle 28-3 • Located outside the body cavity because sperm require lower-than- body temperature for development • Testis serve as both – Exocrine gland: sperm cells are the secretion – Endocrine: testosterone • Coverings of testis – Tunica vaginalis. Originally peritoneum. Serous membrane – Tunica albuginea: thick white connective tissue. Penetrates testis to divide it into lobules. Within lobules are seminiferous tubules and interstitial (Leydig) cells that secrete testosterone. • Tubes through which sperm move – Seminiferous tubules. Site of sperm production – Tubuli recti and rete testis. Pathway to epididymis. Testes 28-4 Descent of Testes • Descent – Pass from abdominal cavity through inguinal canal to scrotum – Guided by fibromuscular gubernaculum – Pass through inguinal rings (bilateral oblique passageway...