What is the function of muscular bag in stomach?

Muscular bag is not an anatomical term or structure in the stomach. The stomach has distinct layers and regions with specific functions. The main parts of the stomach include:

1. Cardiac Region: The cardiac region is the upper portion of the stomach where food enters from the esophagus. It does not have a specific muscular bag.

2. Fundus: The fundus is the dome-shaped upper portion of the stomach above the level of the gastroesophageal junction. It aids in food storage and is made of smooth muscle layers for contraction and relaxation.

3. Body (Corpus): The body is the main portion of the stomach between the fundus and pylorus. It has three layers of smooth muscles (longitudinal, circular, and oblique) that contract to mix and churn the food. These muscular layers work together to create muscular contractions known as peristalsis, propelling food toward the pyloric region.

4. Antrum: The antrum is the distal portion of the stomach located before the pylorus. It also contains smooth muscle layers and plays a role in food mixing, grinding, and emptying into the small intestine.

5. Pylorus: The pylorus is the narrow outlet of the stomach that leads to the duodenum, the first part of the small intestine. It has a thickened muscular layer called the pyloric sphincter, which controls the passage of food into the small intestine.

Please note that the stomach does not have a specific structure referred to as a "muscular bag." If you have further questions about the anatomy or function of the stomach, feel free to ask.