UC San Diego News Center. Unsafe at Any Level: Very Low Blood Alcohol Content Associated With Causing Car Crashes. Even âminimally buzzedâ drivers are more often to blame for fatal car crashes than the sober drivers they collide with, reports a University of California, San Diego study of accidents in the United States.
The pleuroperitoneal membranes fuse with the dorsal mesentery of the esophagus and with the dorsal portion of the septum transversum to complete the partition between the pleural and peritoneal cavities. The membranes form the primitive diaphragm but end up as only a small portion of the fully developed diaphragm.The dorsal mesentery of the esophagus fuses with the two structures septum transversum and the pleuroperitoneal membranes to form the middle of the diaphragm.Other muscle fibers that grow into the dorsal mesentery of the esophagus will develop into the crura of the fully developed diaphragm.he first strucuture to become part of the diaphragm is the septum transversum, a mesodermal strucutre that forms the central tendon of the diaphragm. The septum transversum is identifiable at three weeks of gestation as a mass of mesoderm just posterior to the pericardial cavity, which contains the heart.
Chapter 36: The rectum and anal canal. Rectum. At the level of the middle of the sacrum, the sigmoid colon loses its mesentery and gradually becomes the rectum, which, at the upper limit of the pelvic diaphragm, ends in the anal canal (fig. 36-1). The rectum, about 15 cm long, widens below as the ampulla, which is very distensible.