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 hindgut. With continued development, the body-stalk is later replaced by the umbilical cord.

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

Body stalk anomalies occur in approximately 1 in 15,000 births.[2] They are due to defects in the formation of cephalic, caudal, and lateral embryonic body folds,[3] that result in a reduced or absent umbilical cord.[4]

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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.
  4. Kocherla, K; Kumari, V; Kocherla, PR (January 2015). "Prenatal diagnosis of body stalk complex: A rare entity and review of literature". The Indian Journal of Radiology & Imaging. 25 (1): 67–70. doi:10.4103/0971-3026.150162. PMC 4329692. PMID 25709170.

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