In Hirschsprung's disease the normal portion of the bowel:

Name: In Hirschsprung's disease the normal portion of the bowel:
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In Hirschsprung's disease, the affected segment of the bowel lacks nerve cells in the myenteric plexus, leading to a failure of relaxation and a functional obstruction. The normal portion of the bowel proximal to the affected segment becomes hypertrophied and dilated as it tries to push stool through the non-functioning segment.

In Hirschsprung's Disease the Normal Portion of the Bowel