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Unformatted text preview: duct, the ductus deferens enlarges, forming a region called the ampulla. Sperm are stored in the ductus deferens until peristaltic contractions of the smooth muscles surrounding the ductus force sperm forward during ejaculation. The ejaculatory ducts are short tubes that connect each ductus deferens to the urethra. The urethra is the passageway for urine and semen (sperm and associated secretions). Three regions of the urethra are distinguished: The prostatic urethra passes through the prostate gland. The membranous urethra passes through the urogenital diaphragm (muscles associated with the pelvic region). The spongy (penile) urethra passes through the penis....
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- Spring '10