Archive image from page 203 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 184 THE DEVELOPMENT OF THE CHICK figures of entire embryos. The formation of new somites con- tinues after the end of the period discussed in this chapter, up to about the sixth day. Each somite has a definite value in the developmental history. Fig. 106. — The same embryo from beneath, x 10. a. i. p., Anterior intestinal portal. A. V., Vitelline artery. Int., Intestinal groove. In an embryo of 42 somites (about ninety-six hours), the
Archive image from page 203 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 184 THE DEVELOPMENT OF THE CHICK figures of entire embryos. The formation of new somites con- tinues after the end of the period discussed in this chapter, up to about the sixth day. Each somite has a definite value in the developmental history. Fig. 106. — The same embryo from beneath, x 10. a. i. p., Anterior intestinal portal. A. V., Vitelline artery. Int., Intestinal groove. In an embryo of 42 somites (about ninety-six hours), the value of the somites as determined by their relations and subsequent history is as follows: 1 to 4. Cephalic; entering into the composition of the occipital region of the skull. Prebrachial; , entering into the region between the wing and the skull. Brachial. Between wing and leg. 5 to 16. 17 to 19. 20 to 25.
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