The pyloric sphincter is a band of smooth muscle at the junction between the pylorus the the stomach and the duodenum that the tiny intestine. It plays an essential role in digestion, where it acts as a valve come controls the flow of partially digested food native the stomach come the tiny intestine.

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Anatomy

The pyloric sphincter is a thin, circular band of visceral muscle bordering the pyloric opened at the inferior end of the stomach. The is found at the border that the stomach’s last segment, the pylorus, and the tiny intestine’s first segment, the duodenum. Proceed Scrolling come Read more Below...

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continued From Above... The pylorus is tapered and funnel-shaped, narrowing native the wide body the the stomach to only about an customs in diameter in ~ the pyloric sphincter.

Physiology

The pyloric sphincter plays important roles in controlling the price of digestion and also the direction the chyme movement in the gastrointestinal tract. Food in the stomach is combined with gastric juice produced by the stomach to form a thick, acidic liquid called chyme. Complying with a meal, the stomach stores chyme both to begin its digestion and also to permit the remainder of the cradle system sufficient time come digest the food thoroughly. The pyloric sphincter continues to be closed during eating and also while the stomach mixes food through gastric juice to form chyme.

After the stomach has completed its digestive role, the pyloric sphincter starts to convulse in tide of peristalsis to push chyme toward the pylorus. As each peristaltic tide reaches the pylorus, the pyloric sphincter briefly opens up to permit a tiny mass of chyme come pass into the duodenum. Tide after tide of peristalsis progressively empty the stomach end a period of about 30 minute to one hour.

The pyloric sphincter stays clear of the regurgitation that chyme indigenous the duodenum right into the stomach. It additionally controls the flow of chyme right into the intestine, which provides the intestines through a manageable volume the chyme native which to absorb nutrients.

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