Why is Morrison's pouch important in the supine patient?

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In a patient lying on their back, Morrison's pouch (the hepatorenal recess) is the gravity-dependent space between the liver and the right kidney. Any intraperitoneal fluid—such as blood from trauma or ascites—tends to collect there first, making it the most important area to evaluate on ultrasound in a supine patient. The gallbladder, though located on the inferior surface of the liver, sits in its own fossa and is not contained within Morrison's pouch. The other statements aren’t correct because Morrison's pouch is not the largest peritoneal space, nor is it the site of the pancreas.