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Diagram showing the expansion of amnion and delimitation of the umbilical cord
Section through the embryo
Latin Pedunculus truncalis
Anatomical terminology

The body-stalk, also known as the allantoic stalk,[1] is a band of mesoderm that connects the caudal end of the embryo to the chorion in development. With the formation of the caudal fold, the body-stalk assumes a ventral position; a diverticulum of the yolk-sac extends into the tail fold and is termed the hind-gut. With continued development, the body-stalk is later replaced by the umbilical cord.

Body stalk anomaly occurs in approximately 1 in 15,000 births.[2] It is a result of defects in the formation of cephalic, caudal, and lateral embryonic body folds.[3]

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  1. ^ Arthur Robinson (1913). Cunningham's Textbook of Anatomy. William Wood. p. 54. 
  2. ^ Asim Kurjak (30 June 2013). Donald School Textbook of Transvaginal Sonography. JP Medical Ltd. p. 28. ISBN 978-93-5090-473-2. 
  3. ^ Diana W. Bianchi; Timothy M. Crombleholme; Mary E. D'Alton (1 January 2000). Fetology: Diagnosis & Management of the Fetal Patient. McGraw Hill Professional. ISBN 978-0-8385-2570-8. 

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