Sections: Prologue | Before Lewis & Clark | Lewis & Clark | After Lewis & Clark When Thomas Jefferson sent Lewis and Clark into the West, he patterned their mission on the methods of Enlightenment science: to observe, collect, document, and classify.
Partially digested food, or chyme, from the stomach is mixed with bile from the liver and pancreatic juice from the pancreas to complete its digestion in the duodenum. The jejunum is the middle section of the small intestine that serves as the primary site of nutrient absorption. It measures around 3 feet in length. The ileum is the final section of the small intestine that empties into the large intestine via the ileocecal sphincter.
If we go through the length of the large intestine from left to right, we can see several sections. The large intestine is divided into the caecum (cecum) with its vermiform appendix, the ascending colon, the transverse colon, the descending colon, the sigmoid colon, and the rectum and anal canal. The first part of the large intestine that we'll talk about is the cecum. This is an intraperitoneal pouch-like structure that is about 7.5 centimeters in diameters. It is usually in contact with the anterior abdominal wall and sometimes may cross the pelvic brim to lie in the true pelvis.