It consists of a layer of cells and a thin connective tissue layer. The cells secrete serous fluid. Serosa encloses certain body cavities. Those body cavities are known as the serous cavities.
In serous cavities, serosa secretes a lubricating fluid to reduce the friction due to muscle movement. Serosa comprises two layers. Upper layer consists of secretory epithelial cells, and the lower layer consists of connective tissue. The epithelial layer is a simple squamous layer. It contains a layer of flat nucleated cells, which are capable of secreting serous fluid.
The squamous layer is bound to the connective tissue layer below. Blood vessels and nerve supply is found in the connective tissue layer. Serosa of different organs are known by different names. The main role is to cover the external surface of the organs in the body cavities. The parietal layer secretes the serosa fluid which lubricates the structures in the serous cavities to reduce abrasion and friction.
The visceral membrane contains blood vessels and nerves. The pleura refers to the serosa that covers the thoracic cavity and the lungs. The pericardium is the serous membrane that covers the heart and the mediastinum. What is Adventitia — Definition, Structure, Role 3. Serosa refers to the outermost layer of the visceral layers of the abdomen and thorax. It covers the body cavities that do not directly open to the outside.
The serosa also covers the organs in that cavity. The cavity is then referred to as the serous cavity. The serosa is made up of a connective tissue layer covered by two mesothelial layers. The connective tissue layer holds the two mesothelial layers together. It also contains the blood vessels and nerves. The inner mesothelial layer is referred to as the visceral membrane whereas the outermost layer is called the parietal layer.
The outermost parietal layer secretes the serous fluid. This fluid lubricates the structures in the serous cavity, reducing the abrasion and friction in the thoracic and abdomen cavity.
The serosa that surrounds the stomach is shown in figure 1. Figure 1: Serosa of the Stomach. Based on the anatomical structures covered, each serosa has a specific name. For example, the serosa that covers the thoracic cavity and the lungs is called the pleura. The pericardium is the serous membrane which covers the heart and the mediastinum. The peritoneum is the serous membrane which covers the abdominopelvic cavity and the viscera. Adventitia refers to the outermost of the connective tissue layer that covers a blood vessel, organ or other structure.
The adventitia is made up of loose connective tissue. It binds the blood vessels and organs to the surrounding structures such as body wall to provide support.
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