1. ![Flag for review](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNSIgaGVpZ2h0PSIyNiIgdmlld0JveD0iMCAwIDI1IDI2Ij48cmVjdCB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiBmaWxsPSIjY2ZkNGRiIi8+PC9zdmc+)
A newborn boy does not pass meconium until 48 hours after his birth . Two weeks later his mother reports that he has not been passing stool regularly. Anorectal manometry reveals increased internal anal sphincter pressure on rectal distention with a balloon. Radiographic studies revea l massive dilation of the colon proximal to the rectum. This indicates a developmental abnormality in which of the following embryonic tissues?
Leave A Comment