The Number of Sphincters in the Human Body

The human body contains more than 50 different types of sphincters. The ringed structure known as a sphincter relaxes and contracts to let solids and liquids move from one area of the anatomy to another.

The placement of sphincter muscles within the body determines their classification. While some sphincters are involuntary and controlled by autonomic nerves, others are voluntary and controlled by somatic nerves.

The lower esophageal sphincter, the pyloric sphincter, the ileococcal sphincter, and the anus are among the sphincters that make up the digestive system. Secretions from the pancreatic, liver, and gallbladder can flow through the sphincter of Oddi and into the duodenum. Additionally, the eyes have sphincters.

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.

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