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).

Was this article helpful?

0 0
Getting Back Into Shape After The Pregnancy

Getting Back Into Shape After The Pregnancy

Once your pregnancy is over and done with, your baby is happily in your arms, and youre headed back home from the hospital, youll begin to realize that things have only just begun. Over the next few days, weeks, and months, youre going to increasingly notice that your entire life has changed in more ways than you could ever imagine.

Get My Free Ebook


Post a comment