There are two layers in serous membranes. The bodily cavity's walls are lined with parietal layers of membranes.
The interior bodily cavities and organs, including the heart, lungs, and abdominal cavity, are lined with a thin membrane called the serous membrane, also known as the serosal membrane. Numerous important organs can move without resistance thanks to the serous membrane. The pericardium encloses the heart and some blood arteries, the pleural membranes enclose the lungs, and the peritoneal membrane encloses the abdominal cavity and associated organs. The body has several serous membranes. Additionally, the testes are surrounded by serous membranes (the tunica vaginalis).
Serous membranes are complicated and vary in size. The pericardium and pleura have straightforward structures and rounded edges. The peritoneum is the biggest membrane and has a surface area that can equal the surface area of the skin. It has a convoluted structure in some areas (approximately 1.8-meter square).
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