AST Surgical Technologist Practice Exam

Which layer is the outermost layer of the intestine?

1. Mucosa

2. Submucosa

3. Muscularis

4. Serosa

The correct answer is: Serosa

The outermost layer of the intestine is indeed the serosa. This layer, also known as the visceral peritoneum, serves as a protective covering for the intestines and other abdominal organs. It is composed of connective tissue and mesothelium, which provides a smooth surface to reduce friction between the intestines and surrounding structures in the abdominal cavity. Understanding the structure of the intestines is crucial for surgical technologists, as the serosa can play a significant role in procedures involving the gastrointestinal tract. When surgeries are performed, maintaining the integrity of the serosa is important for preventing infections and ensuring that the intestines function properly after surgery. The other layers, while integral to the function and structure of the intestines, are not the outermost. The mucosa is the innermost layer, responsible for nutrient absorption and secretion. The submucosa provides support and contains blood vessels, nerves, and glands. The muscularis is responsible for the peristaltic movements of the intestine. Together, these layers contribute to the overall function of the intestines, but the serosa is the external layer that provides protection.