Sagittal section of the male bladder and genitalia. |  corpus cavernosum |  corpus spongiosum |  penile urethra |  scrotum |  tunica vaginalis |  cremaster muscle |  spermatic cord | pubic symphysis |  prostate gland | urinary bladder | ureter |  vas deferens | The seminal vesicle secretes 2/3 of the semen with an alkaline fluid to neutralize the acidic environment of developing sperm | external urethral sphincter |  Cowper's (bulbourethral) gland | See previous slide for other descriptions.