What are the pouches formed by the muscular taeniae coli in the large intestine called?

• A. Villous projections
• B. Crypts
• C. Haustra
• D. Diverticula

Answer: (C)

The pouches formed by the muscular taeniae coli in the large intestine are known as haustra. These haustra are characterized by their distinct sac-like bulges that occur along the colon, created by the contraction of the taeniae coli, which are three longitudinal bands of smooth muscle. The segmentation provided by these pouches allows for more effective absorption of water and nutrients as the contents of the colon are processed.

Understanding the structure and function of haustra is important in recognizing how the large intestine operates in the digestive system. Haustra contribute to the overall surface area of the colon, aiding in the absorption and preparation of waste for excretion. This anatomical feature plays a significant role in the motility of the large intestine, facilitating the movement of fecal material through peristalsis and segmental contractions.