Which structure limits the spread of ascitic fluid within the infracolic compartment?

Which structure limits the spread of ascitic fluid within the infracolic compartment?

• A. Transverse Mesocolon
• B. Sigmoid Mesocolon
• C. Root of Mesentery
• D. Greater Omentum

Answer: (C)

The key idea is how the peritoneal spaces are organized and what boundaries shape fluid movement within them. Infracolic space lies below the transverse mesocolon and is divided into right and left halves by the root of the mesentery, which attaches the mesentery of the small intestine to the posterior abdominal wall from near the duodenojejunal junction to the ileocecal junction. This root forms a boundary that constrains the spread of ascitic fluid within the infracolic compartment, effectively isolating the right and left infracolic spaces. The transverse mesocolon separates the supracolic from infracolic compartments, so it doesn’t define the internal division within infracolic space. The sigmoid mesocolon anchors the sigmoid colon in the pelvis and isn’t the barrier that limits intrafracolic spread. The greater omentum can localize some fluid and infection by obliterating spaces, but the primary structural limitation within the infracolic compartment is provided by the root of the mesentery.

The key idea is how the peritoneal spaces are organized and what boundaries shape fluid movement within them. Infracolic space lies below the transverse mesocolon and is divided into right and left halves by the root of the mesentery, which attaches the mesentery of the small intestine to the posterior abdominal wall from near the duodenojejunal junction to the ileocecal junction. This root forms a boundary that constrains the spread of ascitic fluid within the infracolic compartment, effectively isolating the right and left infracolic spaces.

The transverse mesocolon separates the supracolic from infracolic compartments, so it doesn’t define the internal division within infracolic space. The sigmoid mesocolon anchors the sigmoid colon in the pelvis and isn’t the barrier that limits intrafracolic spread. The greater omentum can localize some fluid and infection by obliterating spaces, but the primary structural limitation within the infracolic compartment is provided by the root of the mesentery.