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
- Urethra, ductus force sperm, tightly coiled tube, ampulla. Sperm