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