1. Scope and Goals of Andrology -- Part I. Physiologic Basis -- 2. Physiology of testicular function -- 3. Physiology of sperm maturation and fertilization -- Part II. Classification and Diagnosis of Andrological Disorders -- 4. Classification of andrological disorders -- 5. Anamnesis and Physical Examination -- 6. Ultrasound imaging in andrology -- 7. Endocrine Laboratory Diagnosis -- 8. Cytogenetic and molecular genetic diagnostics -- 9. Semen analysis -- 10. Sperm quality and sperm function tests -- 11. Biopsy and histology of the testis -- Part III. Clinics in Andrology: Secondary Hypogonadism -- 12. Congenital hypogonadotropic hypogonadism of hypothalamic origin -- 13. Congenital hypogonadotropic hypogonadism of pituitary origin and rare syndromes with central hypogonadism -- 14. Delayed puberty in boys -- 15. Pituitary hypogonadism, hyperprolactinemia, and gonadotropin-producing tumors -- Part IV. Clinics in Andrology: Primary Hypogonadism (Disorders at the Testicular Level) -- 16. Anorchia and Polyorchidism -- 17. Undescended testes -- 18. Varicocele -- 19. Orchitis -- 20. Disorders of spermatogenesis and spermiogenesis -- 21. Klinefelter syndrome -- 22. XX male and XYY karyotype -- 23 Structural chromosomal changes -- 24. Testicular tumors -- 25. Senescence and late-onset hypogonadism -- Part V. Clinics in Andrology: Diseases of Seminal Ducts and Accessory Sex Organs -- 26. Infections and inflammation of the seminal ducts and accessory sex glands -- 27. Obstructions of the seminal ducts, cystic fibrosis and congenital aplasia of the ductus deferens -- 28. Immunologically induced infertility -- 29. Andrologically relevant changes in the external genitals -- 30. Disorders of erection, cohabitation and ejaculation -- Part VI. Clinics in Andrology: Disorders of Sexual Differentiation and Androgen Target Organs -- 31. Variants of sex development -- 32. Gynecomastia -- 33. Male androgenetic alopecia -- Part VII. Clinics in Andrology: Disorders of Reproductive Health caused by Environmental and Systemic Diseases -- 34. Testicular dysfunction in systemic diseases -- 35. Environmental Influences on Male Reproductive Health -- Part VIII. Andrological Therapy -- 36. Therapy with testosterone -- 37. Abuse of anabolic androgenic steroids (AAS) for doping -- 38. Treatment of hypogonadism of hypothalamic or pituitary origin -- 39. Therapeutic attempts in idiopathic infertility -- 40. Gynecology relevant to andrology -- 41. Assisted fertilization -- 42. Cryopreservation of human sperm and testicular germ cell tissue for fertility reserve -- Part IX. Sexual Health -- 43. Sexual Medicine and Andrology -- 44. Involuntary Childlessness from the Perspective of Sexual Medicine -- Part X. Male Contraception -- 45. Male contribution to contraception -- 46. Vasectomy -- 47. Approaches to hormonal male contraception -- 48. Non-hormonal Approaches to Male Contraception -- Part XI. Law and Ethics in Reproductive Medicine -- 49. Legal regulations in Andrology and Reproductive Medicine -- 50. Ethical criteria of reproductive medicine. .