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UKCD ANA534 Body Cav

learning objectives for body cavity development

QuestionAnswer
The intra-embryonic coelom will eventually be divided into four body cavities. List them. Pericardial cavity (1); pleural cavities (2); and peritoneal cavity (1).
What two partitions must develop to form these cavities? The diaphragm and the fibrous pericardium.
How is the pericardial cavity in free communication with the peritoneal cavity? Through the paired pericardioperitoneal canals.
What forms the fibrous pericardium? Two pleuropericardial membranes (sheets of somatic mesoderm) form the fibrous pericardium by growing inward from either lateral aspect of the embryo.
What three sources fuse to form the diaphragm? septum transversum, two pleuroperitoneal membranes and dorsal mesentery
What part does the septum transversum form? forms the central portion of the diaphragm - including the central tendon
What part does the two pleuroperitoneal membranes form? largely responsible for the peripheral regions of the diaphragm, pleura and perioneum that cover its upper and lower surfaces respectively
What part does the dorsal mesentery of the esophagus forms ? the crura of the diaphragm.
Where is the septum transversum formed and what spinal cord levels innervate it? The septum transversum forms in the neck region by fusion of the third, forth and fifth cervical segments and is therefore innervated by spinal nerves from C3, 4, 5.
How do the pleural cavities form? As the lung buds develop, the splanchnic mesoderm covering them is invaginated into the pericardioperitoneal canals. This portion of each canal becomes the pleural cavity on each side.
When does the respiratory system start to form? About week 4
How does the respiratory system start to form? a median longitudinal groove (laryngotracheal groove) develops in pharyngeal floor, edges of groove fuse and form a laryngotracheal tube whose lumen is separated from foregut.
What else occurs in respiratory formation? A lung bud grows outward from either side of the tube invaginating the intra-embryonic coelom. This part of the coelom forms the pleural sacs around each lung bud. Visceral and parietal pleura then form.
Created by: wiechartm