LUNGS AND PLEURAL SACS

Describe the development, adult anatomy, and function of the lungs and pleural sacs

Describe the development, adult anatomy, and function of the lungs and pleural sacs

Introduction

Pleural sac is also known as pleural mesothelioma. This is a condition of the development of cancer cells in the pleura. The pleura is a sac in the human body which is used for enclosing between the mesothelium and the lungs. It is a thin membrane in the human body which is important for the lungs in proper expansion and contraction during the breathing process. These days, this form of the lungs cancer is very prevalent form of mesothelioma. There are two main layers of cells for the composition of mesothelium. Among these two layers, one layer is attached with the body; on the other hand the second layer is used for the creation of the pouch (Moore, 1999, p. 23). This mesothelium is used for the production of the lubricating fluid which is helpful for both the layers in order to slide over each other. However, the main purpose of this paper is to make an analysis on the development, adult anatomy and function of lungs and pleural sacs.

Development of Lungs and Pleural Sacs

Pleural pressure is considered to be the pressure which surrounds in the lungs along with the pleural space. The pleura is considered to be that thin membrane in the human body which is used for conducting the investigations about the lungs and lines the walls of the thoracic activity. During the process of development, the lungs of the human body start growing in the pleural sacs till the time they are fully surrounded by the pleural sacs. There are two main sides of the pleura sac i.e. visceral pleura and the parietal pleura. Visceral pleura is that side of pleura which is used in properly covering the lungs. On the other hand, parietal pleura is that side of the lungs which is used for covering the chest wall. These two sides remain on the continuous basis and their meeting point is the hilum of the lung. These two sides of the membranes are in the opposite direction with each other. The three kinds of pressures are used for the purpose of defining the size of the lungs i.e. the alveolar pressure, pleural pressure and the transpulmonary pressure. The size of the lungs is measured by their differences. The bigger difference leads towards the bigger size of the lung (Moore, 1999, p. 23). The lower boundary of the pleural sacs (cavities) is the transition line in the diaphragmatic costal pleura (Healey, 1990, p. 90). On the right side, it crosses the linea mammillaris VII edge on linea axillaris media - IX edge and then go horizontally, intersecting X and XI of the ribs, the meeting place of the lower and rear edges on the head XII rib. On the left side of the lower limit of the pleura is slightly lower than on the ...