Internal Male Reproductive Organ

Internal Male Reproductive System

Internal

• Testes
  • It is the male sex glands
  • Located in the scrotum, one testis in each compartment
  • Functions
    • Seminiferous tubules form spermatozoa
    • Interstitial cells secrete testosterone main androgen; increase protein synthesis, induce growth of secondary sex characteristics
• Epididymis
  • It conducts semen from testes to vas deferens; matures while semen is stored before ejaculation.
• Vas deferens
  • Conducts sperm and fluid from each epididymis to an ejaculatory duct.
• Spermatic cords
  • The spermatic cord passes through the inguinal canal. At the deep inguinal ring the structures within the cord divergent. It suspends the testes in the scrotum.
• Seminal vesicles
  • It secretes fluid that constitutes about 30% of semen.
• Ejaculatory duct
  • Ejaculate semen into the urethra.
• Prostate gland
  • Secrets about 60% of semen; secretion is alkaline, which increases sperm mortality; contains the enzymes acid phosphatase.

External

• Scrotum
  • It contains the testes, epididymis, and the first part of seminal ducts; sperm develops at 2 to 3 degrees below body temperature.
• Penis
  • Contains urethra; contain vascular spaces that when filled with blood cause erection.