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Chapter-09 Foldings of Embryo

BOOK TITLE: Essentials of Anatomy for Dental Students

Author
1. Selvakumari TL
ISBN
9789352703548
DOI
10.5005/jp/books/14250_10
Edition
1/e
Publishing Year
2018
Pages
2
Author Affiliations
1. Sri Venkateswara Dental College and Hospital, Thalambur, Chennai, Tamil Nadu, India
Chapter keywords
Trilaminar embryo, foldings of embryo, caudal folding, cranial folding, endodermal tube connecting stalk, foregut, midgut, hindgut

Abstract

During the third week of fertilization, the zygote has three germ layers which form the trilaminar embryo. This embryo is in the form of pear shaped disk and after the formation of trilaminar disk undergoes many foldings. These foldings are the caudal folding, right and left lateral foldings and cranial folding. These foldings have effects on the embryo such as the disk like structure gets converted into cylindrical structure by the lateral foldings, the connecting stalk develops into the umbilical cord, the endoderm gets elongated and the yolk sac becomes narrow. This elongated endodermal tube is further divided into subdivisions: the part cranial to the connecting stalk becomes the foregut, the part in relation to the connecting stalk is the midgut and the part caudal to the connecting stalk becomes the hindgut.

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