The detachment of peritoneal adherences as forms the basis of many 
gastrointestinal surgical procedures is shown in a dissection specimen. 
The greater omentum is detached from the transverse colon, giving access
 to the omental bursa. The descending colon and mesocolon are detached, 
the so-called left visceral rotation. The Cattel-Braasch manoeuvre - 
detaching and lifting the ascending (meso) colon and small intestines, 
to give access to the peritoneal back wall - is demonstrated. This also 
unveils the hidden part of the duodenum. Finally, it is shown how the 
mesocolons and the mesentery of the small intestine form a continuity 
that  rotated with the intestines embryologically.
This video is from the MOOC 'Anatomy of the abdomen and pelvis: a 
journey from basis to clinic' by the Leiden University Medical Center .