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Chapter 4 Male Sexual Anatomy and Physiology

Chapter 4 Male Sexual Anatomy and Physiology. The Penis. External anatomy of the penis includes: Foreskin, glans, shaft, root. Why is it important to conduct regular genital self-exams, and what should a man look for?. The Penis. The Penis. Internal anatomy of the penis includes:

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Chapter 4 Male Sexual Anatomy and Physiology

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  1. Chapter 4 Male Sexual Anatomy and Physiology

  2. The Penis • External anatomy of the penis includes: • Foreskin, glans, shaft, root Why is it important to conduct regular genital self-exams, and what should a man look for?

  3. The Penis

  4. The Penis • Internal anatomy of the penis includes: • Cavernous bodies (corpora cavernosa) • Spongy body (corpus spongiosum) • Penile urethra

  5. The Penis

  6. The Penis • Corona • Frenulum • Glans

  7. The Penis

  8. The Scrotum • Sac or pouch with two chambers • Muscle layer (tunica dartos) • Pulls sac closer to body in cold temperatures • Spermatic cord

  9. The Penis

  10. The Testes • Testes • Secrete male hormones • Produce sperm • Cryptorchidism • Undescended testis • Self-exam is recommended

  11. Underlying Structures of the Scrotum

  12. The Testes • Seminiferous tubules • Site of sperm production • Interstitial cells • Major source of androgens • Epididymis • Sperm maturation

  13. Internal Structure of a Testis

  14. The Vas Deferens • Move sperm from scrotum to ejaculatory duct through prostate • Ejaculatory ducts open into the urethra

  15. Male Sexual Anatomy

  16. Male Sexual Anatomy • Seminal Vesicle • Secretes 70% of seminal fluid • Prostate Gland • Secretes 30% of seminal fluid • Cowper’s Glands • Secretes fluid before ejaculations • May contain active, healthy sperm • Semen (seminal fluid) • Volume is about 1 teaspoon • 200 to 500 million sperm

  17. Erection • Coordinated by autonomic nervous system • Arteries expand • Blood out flow cannot keep up with in flow • Capacity for erection is present at birth • Psychogenic and physiogenic erections

  18. Ejaculation • Spinal reflex triggers two phases • Emission • Fluid in urethral bulb • Expulsion • Semen expelled • Retrograde ejaculation • Nocturnal ejaculation

  19. Male Sexual Anatomy during Ejaculation

  20. Concerns about Sexual FunctioningPenis Size • Penis size is seen as a symbol of virility • Erect penises show less variation than flaccid • Size NOT related to sexual satisfaction • Penile augmentation • Genital retraction syndrome

  21. Concerns about Sexual Functioning • Phimosis • Extremely tight foreskin • Circumcision • Hygienic value & risk for STI’s question • Medical risks • AAP: moderate opposition • Data not significant to recommend routine procedure

  22. Male Circumcision

  23. Male Genital HealthPenis Health-Care Issues • Cleanliness • Smegma • Infections • Reaction to vaginal secretions • Injuries • Penile cancer

  24. Male Genital HealthTesticle Health-Care Issues • Testicular Cancer • More common in young men (20 to 35 years old) • Risk factors • Hard or irregular mass in testes • Survival is greater than 90% if detected early

  25. Male Genital HealthProstate Health-Care Issues • Prostate diseases • Prostatitis • enlarged and inflamed • Benign prostatic hyperplasia • Prostate cancer • PSA test • Treatment options for prostate cancer

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