U.S. Department of Health and Human Services

Anatomy A-Z

Select a letter to locate an anatomy topic.

The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) conducts, supports, and coordinates research on many of the most serious diseases affecting public health. The NIDDK cannot provide medical advice for individuals. The information provided here is informed by NIDDK research, reviewed by doctors, and provided to help you understand more about the diseases and conditions you or your loved ones may face. The NIDDK is part of the National Institutes of Health, the medical research agency of the United States.​

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A

Anatomy of the Kidneys


Anatomy of the Urinary System


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Medical Tests for Kidney Function


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T

The Kidneys and How They Work

Explains what kidneys do and why they are important to maintain life. Describes the internal anatomy of the kidney. This publication is also available in Spanish.

The Urinary Tract and How It Works

Details the anatomy and function of the urinary tract, explains the importance of the urinary tract, and describes what affect the amount of urine a person produces.

Y

Your Digestive System and How It Works

The digestive system is made up of the gastrointestinal (GI) tract-also called the digestive tract-and the liver, pancreas, and the gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus.