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(F) increased folding of the rostral neuropore

(E) Arrest of the notochord development at the level of L 4

(D) Arrest of the notochord development at the level of L 1

(C) Increased migration of the neural cells into the wall of the colon

(B) Failure of mesoderm cells to migrate to the wall of the colon

(A) Failure of neural crest cells to migrate to the wall of the colon

Chronic constipation leads a teenage patient to seek medical help. A barium enema revealed a megacolon involving the rectum and sigmoid colon. The differential for this problem included Hirschsprung's Disease. What is the embryologic process that is lacking for Hirschsprung's Disease?

Question 8 of 40

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