Duodenal bulb

Duodenal Bulb

The duodenal bulb is a part of the duodenum, which is the first section of the small intestine. It is located at the beginning of the duodenum, just after the pylorus of the stomach. The duodenal bulb plays a crucial role in the digestion process by receiving partially digested food from the stomach and further breaking it down before it continues through the rest of the small intestine.

Anatomy

The duodenal bulb is a short, curved segment of the duodenum that measures approximately 5-7 centimeters in length. It is shaped like a bulb or a cap and is often referred to as the "cap of the duodenum." The bulb is situated in the upper abdomen, slightly to the right of the midline.

Function

The main function of the duodenal bulb is to receive partially digested food, known as chyme, from the stomach. It acts as a reservoir, allowing the chyme to mix with digestive enzymes and bile before it continues its journey through the small intestine. The duodenal bulb also regulates the release of chyme into the rest of the duodenum, ensuring a controlled flow of food for optimal digestion and absorption.

Clinical Significance

The duodenal bulb can be affected by various medical conditions, including duodenal ulcers and duodenitis. Duodenal ulcers are open sores that develop on the lining of the duodenum, often caused by the bacterium Helicobacter pylori or the prolonged use of nonsteroidal anti-inflammatory drugs (NSAIDs). Duodenitis refers to inflammation of the duodenal bulb, which can be caused by infections, autoimmune disorders, or irritants such as alcohol and smoking.

See Also

• Duodenum
• Pylorus
• Chyme
• Duodenal Ulcers
• Duodenitis