Lateral Plate Mesoderm

Lateral plate mesoderm splits into parietal and visceral layers, which line the intraembryonic cavity and surround the organs, respectively (Figs. 5.9, C and D, 5.10, and 5.13 A). Mesoderm from the parietal layer, together with overlying ectoderm, will form the lateral and ventral body wall. The visceral layer and embryonic endoderm will form the wall of the gut (Fig. 5.135). Mesoderm

Lateral Plate Mesoderm

Figure 5.13 A. Transverse section through a 21-day embryo in the region of the mesonephros showing parietal and visceral mesoderm layers. The intraembryonic cavities communicate with the extraembryonic cavity (chorionic cavity). B. Section at the end of the fourth week. Parietal mesoderm and overlying ectoderm form the ventral and lateral body wall. Note the peritoneal (serous) membrane.

Figure 5.13 A. Transverse section through a 21-day embryo in the region of the mesonephros showing parietal and visceral mesoderm layers. The intraembryonic cavities communicate with the extraembryonic cavity (chorionic cavity). B. Section at the end of the fourth week. Parietal mesoderm and overlying ectoderm form the ventral and lateral body wall. Note the peritoneal (serous) membrane.

cells of the parietal layer surrounding the intraembryonic cavity will form thin membranes, the mesothelial membranes, or serous membranes, which will line the peritoneal, pleural, and pericardial cavities and secrete serous fluid (Fig. 5.13B). Mesoderm cells of the visceral layer will form a thin serous membrane around each organ (see Chapter 10).

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