Embryology (1949) Embryology embryology00bart Year: 1949 SOMATOPLEURE SPLANCHNOPLEURE NOTOCHORD EPIMYOCARDIUM Fig. 126. A section through the intestinal portal. The two large vesicles in the mesoderm are the amniocardiac vesicles. Note the thick-walled epimyocar- dium, which will form a part of the muscular layer of the heart. The epi- myocardial layers move toward the midline and pinch together the endoderm, thereby closing the gut cavity. See also Figure 104. SOMITE - â-'-^sfl NEURAL FOLD /â ECTODERM M^N.^ â MESODERM ENDODERM 1 NOTOCHORD Fig. 127. A section through a pair of somites
Embryology (1949) Embryology embryology00bart Year: 1949 SOMATOPLEURE SPLANCHNOPLEURE NOTOCHORD EPIMYOCARDIUM Fig. 126. A section through the intestinal portal. The two large vesicles in the mesoderm are the amniocardiac vesicles. Note the thick-walled epimyocar- dium, which will form a part of the muscular layer of the heart. The epi- myocardial layers move toward the midline and pinch together the endoderm, thereby closing the gut cavity. See also Figure 104. SOMITE - â-'-^sfl NEURAL FOLD /â ECTODERM M^N.^ â MESODERM ENDODERM 1 NOTOCHORD Fig. 127. A section through a pair of somites ot a 25-hour chick embryo. The neural folds are widely separated and the notochord is between the neural tube and the endoderm. In some regions the separation of the mesoderm into two layers can be seen. PRIMITIVE STREAK FlG. 128. The primitive streak in a 2 5-hour embryo. The ectoderm, meso- derm, and endoderm fuse into the streak. A primitive groove is visible.
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