. The development of the chick; an introduction to embryology . ?2n S*^?c; >•?/ X ^. 80 Tui: i)i:\KL();.\T of the chick the latter which coi-i-esponds to the future vascular area. Themesoblast grows out, not only from the sides of the head-processand piimitive streak, but also from the hind end of the latter,that is from the primitive plate. The mesoblast thus extends intothe ojiaque area behind the embryo at a very early stage ( and 44). This ])art of the mesoblast is homologous with themesoblast of the ventral lip of the blastopore of reptiles andamphibia, and, like it, is the
. The development of the chick; an introduction to embryology . ?2n S*^?c; >•?/ X ^. 80 Tui: i)i:\KL();.\T of the chick the latter which coi-i-esponds to the future vascular area. Themesoblast grows out, not only from the sides of the head-processand piimitive streak, but also from the hind end of the latter,that is from the primitive plate. The mesoblast thus extends intothe ojiaque area behind the embryo at a very early stage ( and 44). This ])art of the mesoblast is homologous with themesoblast of the ventral lip of the blastopore of reptiles andamphibia, and, like it, is the fiist j)lace of formation of ])lood. The primitive groove must ])e regarded as an expression ofthe forces of invagination of the mesoblast, and the primitivefolds as the lips of this invagination. Mes
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