𝔖 Bobbio Scriptorium
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Restitution of the tail in the early chick embryo

✍ Scribed by Zwilling, Edgar

Publisher
John Wiley and Sons
Year
1942
Tongue
English
Weight
509 KB
Volume
91
Category
Article
ISSN
0022-104X

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✦ Synopsis

SIX FIGURES

A unique situation exists in the tail-bud of most vertebrate embryos. Even after the rest of the body has undergone considerable determination and development, tlie tail anlad oe contains a large mass of undifferentiated and presumably indifferent cells. The undifferentiated tail mass is most prominent, in chick embryos, from about the 18-to the 24-somite stages. This condition is preceded by a condensation of the primitive streak and followed by one in which the undifferentiated tissue gradually diminishes in bulk as the various tail structures form from it. A small remnant is present in the distal tip of tlie tail of embryos as old as 7 days. Graper ('33) has

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