Ureters, Urinary Bladder, and Urethra

• Ureters - are two slender tubes each 25 to 30 cm long and 6 mm in diameter
• Ureters - run from the renal hilum to the posterior aspect of the bladder, which enter at a slight angle
• Urinary Bladder - a smooth, collapsible, muscular sac that stores urine temporarily
• What are the openings of the bladder?

  Ureteral Orifices, Internal Urethral Orifice
• Trigone - the smooth triangular region of the bladder base outlined by the three openings
• Detrusor Muscle - the collective term for the three layers of smooth muscle of the bladder wall
• Transitional Epithelium - a mucosa; it is a special type of epithelium
• Urethra - a thin-walled tube that carries urine by peristalsis from the bladder to the outside of the boy
• Internal Urethral Sphincter - a thickening of the smooth muscle; an involuntary sphincter that keeps the urethra closed when urine is not being pissed
• External Urethral Sphincter - formed by the skeletal muscle as the urethra passes through the pelvic floor; it is voluntarily controlled
• What are the three named regions of the male urethra?

  Prostatic, Membranous, Spongy Urethrae
• Micturition - the act of emptying the bladder
• What is the other term for micturition?

  Voiding