The duodenum is the proximal part of the small intestine and extends from the '''pylorus''' of the [[Monogastric Stomach - Anatomy & Physiology|stomach]] to the '''[[Jejunum - Anatomy & Physiology|jejunum]]'''. It has descending and ascending portions and both portions have digestive and absorptive functions. | The duodenum is the proximal part of the small intestine and extends from the '''pylorus''' of the [[Monogastric Stomach - Anatomy & Physiology|stomach]] to the '''[[Jejunum - Anatomy & Physiology|jejunum]]'''. It has descending and ascending portions and both portions have digestive and absorptive functions. |