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  Indian J Med Microbiol
 

Figure 1: Formation of pleural cavity and its separation from pericardial and peritoneal cavities. (a) Pericardio-peritoneal canal enlarges to form the pleural cavity. The pleural cavity communicates freely with the pericardial and peritoneal cavities. (b) Gradual formation of pericardio-pleural and pleuro-peritoneal membranes and widening of the three cavities. (c) The pleural cavity is completely separated from the pericardial and peritoneal cavities by the formation of pericardio-pleural and pleuro-peritoneal membranes

Figure 1: Formation of pleural cavity and its separation from pericardial and peritoneal cavities. (a) Pericardio-peritoneal canal enlarges to form the pleural cavity. The pleural cavity communicates freely with the pericardial and peritoneal cavities. (b) Gradual formation of pericardio-pleural and pleuro-peritoneal membranes and widening of the three cavities. (c) The pleural cavity is completely separated from the pericardial and peritoneal cavities by the formation of pericardio-pleural and pleuro-peritoneal membranes