4 | transportation finance briefing papers process are cyclical and occur incrementally over time, requiring sustained leader-ship over a number of years to achieve full implementation.Table 2.1 provides a snapshot of the state of performance measurement among 23 state DOTs that responded to a recent survey.
exists and is an alternate of . The pleural membrane is a double-layered serous membrane found in the thoracic cavity. The outer layer is called the parietal pleura and lines the thoracic wall, and the inner layer is called the visceral pleura and covers the lungs. The membranes produce lubricating serous fluid that causes them to adhere closely to one another.
Pleural Membrane Function. The Pleural Cavity is filled with a small amount of serous fluid which forms a thin film of liquid between the pleural layers. This is vital in that it prevents separation of the two pleural layers and lubricates the surface, so the lungs can move easily within the thoracic cavity.ach lung is placed within a separate layer of membrane, thus there are two pleural sacs. The space between the two sacs is known as the mediastinum, and is almost in the midline of the thorax. The pleura covering the surface of the lung is known as pulmonary pleura or visceral pleura.