Pleural Fluid. It is mostly made up of tissue fluid
Pleural fluid is the fluid that's located between the pleural membranes that cover the lungs. If too much fluid builds up, it's called a pleural effusion.
Each lung lies within the pleural cavity within which the lung expands. The pleural cavity is lined by two transparent elastic membranes called the pleura/pleural membranes. The inner pleuron covers the lung the outer pleuron is in contact with the walls of the thorax and the diaphragm. A thin layer of lubricating fluid between the pleural membranes allows them to glide over each other when the lungs expand and contract during breathing. So your answer is the pleural fluid lies between the pleural membranes.
Surfactant is pleural fluid.
The lungs are surrounded by two membranes, the pleurae. The outer pleura is attached to the chest wall and is known as the Parietal pleura; the inner one is attached to the lung and other visceral tissues and is known as the Visceral pleura. In between the two is a thin space known as the pleural cavity or pleural space. It is filled with pleural fluid, a serous fluid produced by the pleura.
Pleural fluid is contained between the parietal pleura and chest wall.
pleural membranes are separated from parietal by a thin film of watery fluid and usually cover an internal organ like lungs. pericardial membranes surround the heart peritioneal membranes line the abdominopelvic cavity So basically, the only difference is what each variety membrane surrounds or covers.
Pleural pressure is negative (lower than alveolar pressure or barometric pressure) because of a "suction effect" caused by lung recoil. As the lungs recoil elastically, the inner and outer pleural membranes tend to be pulled apart but fluid within the pleural cavity keeps the inner and outer pleural membranes close together. This pulling force decreases the pressure between the inner and outer membranes lining the pleural cavity - an effect that can be appreciated by stacking several plastic cups together, submersing the stack in soapy water ensuring that the spaces between the cups fill with water, and then lift the stack of cups out of the water and try to pull the cups apart. A suction effect will occur producing negative pressure in fluid-filled spaces between the cups as you attempt to pull them apart. The fluid-filled space between the cups is like the fluid-filled space in the pleural cavity. That is why pleural pressure is negative.
The two pleural membranes are the visceral pleura and the parietal pleura. The visceral pleura is the innermost layer that covers the surface of the lungs, while the parietal pleura lines the chest cavity. These membranes create a fluid-filled space called the pleural cavity, which helps to reduce friction and allows for smooth movement of the lungs during breathing.
Pleural fluid is present in the pleural sac. This fluid act as a lubricant and minimizes the friction between outer and inner layer of pleura, during respiration.
Pleural cavity is the potential space. There is no gap between the outer and the inner pleura. There is very little fluid in the pleural cavity. You have negative pressure in the pleural cavity.
The lungs are surrounded by two membranes, the pleurae. The outer pleura covers and is attached to the chest wall and is known as the parietal pleura. The inner one covers and is attached to the lung and other visceral tissues i.e. vessels, bronchi and nerves and is known as the visceral pleura. In between the two is an actual thin space known as the pleural cavity or pleural space normally containing a small amount of pleural fluid.=The parietal pleura is highly sensitive to pain; the visceral pleura is not.=
Pleural biopsy is usually ordered when pleural fluid obtained by another procedure called thoracentesis (aspiration of pleural fluid) suggests infection, signs of cancer, or tuberculosis.