External anatomy of the penis includes: External anatomy of the penis includes



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External anatomy of the penis includes:

  • External anatomy of the penis includes:

    • Foreskin, glans, shaft, root




Internal anatomy of the penis includes:

  • Internal anatomy of the penis includes:

    • Cavernous bodies (corpora cavernosa)
    • Spongy body (corpus spongiosum)
    • Penile urethra




Corona

  • Corona

  • Frenulum

  • Glans





Sac or pouch with two chambers

  • Sac or pouch with two chambers

  • Muscle layer (tunica dartos)

    • Pulls sac closer to body in cold temperatures
  • Spermatic cord





  • Testes

  • Cryptorchidism

    • Undescended testis
  • Self-exam is recommended





Seminiferous tubules

  • Seminiferous tubules

    • Site of sperm production
  • Interstitial cells

    • Major source of androgens
  • Epididymis

    • Sperm maturation




Move sperm from scrotum to ejaculatory duct through prostate

  • Move sperm from scrotum to ejaculatory duct through prostate

  • Ejaculatory ducts open into the urethra





Seminal Vesicle

  • Seminal Vesicle

    • Secretes 70% of seminal fluid
  • Prostate Gland

    • Secretes 30% of seminal fluid
  • Cowper’s Glands

  • Semen (seminal fluid)

    • Volume is about 1 teaspoon
    • 200 to 500 million sperm


Coordinated by autonomic nervous system

  • 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



Spinal reflex triggers two phases

  • Spinal reflex triggers two phases

    • Emission
      • Fluid in urethral bulb
    • Expulsion
      • Semen expelled
  • Retrograde ejaculation

  • Nocturnal ejaculation





Penis size is seen as a symbol of virility

  • 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



Phimosis

  • Phimosis

    • Extremely tight foreskin
  • Circumcision





Cleanliness

  • Cleanliness

    • Smegma
    • Infections
  • Reaction to vaginal secretions

  • Injuries

  • Penile cancer



Testicular Cancer

  • 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


Prostate diseases

  • Prostate diseases

    • Prostatitis
      • enlarged and inflamed
    • Benign prostatic hyperplasia
    • Prostate cancer
  • PSA test

  • Treatment options for prostate cancer



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