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Folding of heart tube

Authoring team

Once formed, the heart tube elongates at a rate that is greater than the surrounding primitive pericardial cavity can accommodate. Consequently, from day 22 onwards the:

  • cephalic end of the tube is displaced ventrally, caudally and to the right
  • caudal end of the tube is displaced dorsally, ventrally and to the left

Simultaneously, individual regions of the tube are expanding and differentiating such that by the end of folding:

  • the region of the future atria lies craniodorsal to the future ventricular region
  • the primitive right and left atria lie dorsolateral to the primitive right ventricular outflow tract

Folding is complete by day 28.

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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