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What is the urinary system?

The urinary system includes the kidneys, ureters, bladder and urethra. This body system helps you remove waste products by making urine. It also helps your body keep correct levels of water and electrolytes.
Karim Chamie, MD
Urology
The urinary system is composed of the kidneys, the ureter and the bladder. The kidneys drain the urine through the ureter, which is a long narrow tube that drains down into the bladder.

The kidney itself is composed of the meat of the kidney (the parenchyma) and the sink, or collecting system where the urine is secreted. Each ureter drains down into the bladder.
 
The bladder has multiple layers -- the internal layer of the bladder is called the mucosa, followed by the lamina propria layer of the bladder, the muscular layer of the bladder, and the fatty layer of the bladder.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.