THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The duodenum is the shortest section, on average measuring from 20 cm to 25 cm in length. Its proximal end is connected to the antrum of the stomach, separated by the pylorus, and the distal end blends into the beginning of the jejunum.

Detailed explanation-2: -The duodenum is the first part of the small intestine (5-7 m), followed by the jejunum and ileum (in that order); it is also the widest and shortest (25 cm) part of the small intestine. The duodenum is a C-shaped or horseshoe-shaped structure that lies in the upper abdomen near the midline (see the image below).

Detailed explanation-3: -The duodenum precedes the jejunum and ileum and is the shortest part of the small intestine. In humans, the duodenum is a hollow jointed tube about 25–38 centimetres (10–15 inches) long connecting the stomach to the middle part of the small intestine.

Detailed explanation-4: -It is composed of four distinct parts. The first 2.5 cm of the first part of the duodenum is intraperitoneal. Meanwhile, the remaining parts of the duodenum are retroperitoneal.