A premature infant develops jaundice. Laboratory test results are negative for hemolytic disease of the newborn, but the infant’s bilirubin level continues to rise. Abnormal urinalysis test results include a dark yellow color, positive Ictotest, and needle-shaped crystals seen on microscopic examination. What is the most probable cause of the infant’s jaundice?

Patient has some kind of congenital disease that causes jaundice.

between the two muscle layers is the myenteric or auerbach's plexus, which controls peristalsis. in the colon, the muscularis externa is much thicker because the feces are large and heavy, requiring more force to push along. the stomach has a third layer of muscularis externa: the inner oblique layer.