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The Ureter in Veterinary Ultrasound: A Closer Look at Muscle Contraction and Urine Transport

Written by Fred Gromalak, DVM | Feb 3, 2025 2:30:00 PM

In veterinary medicine, understanding the complexities of an animal’s urinary system is vital for both diagnosis and treatment. One of the key components often overlooked is the ureter, which plays a critical role in transporting urine from the kidneys to the bladder.

While it may seem like a simple passageway, the ureter’s contraction is an active and highly coordinated process driven by smooth muscle fibers in the ureteral wall. These muscles are responsible for generating peristalsis—a series of wave-like contractions that move urine efficiently, regardless of the animal's position or activity level.

Why is this important in veterinary care?

Whether we’re treating common conditions like urinary tract infections (UTIs) or dealing with more complex issues like ureteral obstructions or neurogenic bladder disorders, understanding the role of these small but vital muscles helps veterinary professionals diagnose and treat urinary issues more effectively. 


Key Takeaways for Veterinarians:

  • Smooth Muscle Contractions: The ureter’s smooth muscle fibers contract in a coordinated fashion to push urine towards the bladder.
  • Peristalsis: These muscular contractions are crucial for maintaining normal urinary flow, even in animals experiencing stress or pressure.
  • Implications for Treatment: Disruption of these contractions (due to injury, infection, or nerve damage) can lead to urinary retention or reflux, complicating treatment strategies.

 

Video of Dilated Right Ureter:


The ability to understand and address issues related to the ureter’s contraction can make a big difference in the outcomes for animals, whether it's through targeted therapies or surgical interventions.

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