Pyloric Sphincter

The pyloric sphincter, or valve, is a strong ring of smooth muscle at the end of the pyloric canal and lets food pass from the stomach to the duodenum. It receives sympathetic innervation from celiac ganglion. It is located at the base of the stomach.
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The pyloric valve keeps the stomach shut at the far end so that it has a chance to digest proteins. Then it opens and allows the contents of the stomach, now called chyme, to pass through and enter the small intestine, whose first section is called duodenum and it does the majority of digestion and some absorption.