File:Ewart1897 05.jpg

Fig. 5. The 42 days embryo and its appendages

Note especially that the girdle (t.g.) lies near the absorbing area (a, b, c), and that the allantois is now a relatively large sac in contact with the greater extent of the outer tunic, and surrounding the greater part of the yolk sac.

Historic Disclaimer - information about historic embryology pages

Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Ewart, J.C. A Critical Period in the Development of the Horse. London: Adam and Charles Black (1897).