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What is Extrinsic Obstruction of the Ureter?

How the Urinary Tract Works?

Male Urinary Tract
Male Urinary Tract
Medical Illustration Copyright © 2015 Nucleus Medical Media, All rights reserved

Female Urinary Tract
Female Urinary Tract
Medical Illustration Copyright © 2015 Nucleus Medical Media, All rights reserved

The bladder and kidneys are part of the urinary system the organs in our bodies that produce, store and pass urine. You have 2 kidneys that produce urine. Then urine is stored in the bladder. The muscles in the lower part of your abdomen hold your bladder in place.

When it isn't full of urine, the bladder is relaxed. When nerve signals in your brain let you know that your bladder is getting full, you feel the need to urinate. If your urinary system is normal, you can delay urination for some time.

Once you are ready to urinate, the brain sends a signal to the bladder. Then the bladder muscles squeeze (or "contract"). This forces the urine out through the urethra, the tube that carries urine from your body. The urethra has muscles called sphincters. They help keep the urethra closed so urine doesn't leak before you're ready to go to the bathroom. These sphincters open up when the bladder contracts.

What is Extrinsic Obstruction of the Ureter?

The ureter is a muscular tube that transfers urine from the kidney to the bladder. It is about 10 inches long, with the upper half in the belly and the lower half in the pelvic area. But what happens when the ureter becomes blocked?

Extrinsic obstruction of the ureter is caused when organs press against the ureter, causing a blockage in the ureter. This affects the flow of urine out of the ureter. After some time, urine can build up, which can hurt the kidney.