Anatomic features and clinical significance of the descending duodenum
TIAN Dong, ZHONG Li, TUN Yi, WANG Jia-Wei, WANG Yu, HU Dan-Dan, DIAO Guo-Gang, FU Mao-Yong
Chinese Journal of Clinical Anatomy ›› 2011, Vol. 29 ›› Issue (3) : 284-286.
Anatomic features and clinical significance of the descending duodenum
Objective To provide applied anatomic data for the diagnosis and treatment of the descending duodenal diseases and reducing iatrogenic endoscopic injury. Methods Forty adult cadaveric specimens fixed with formalin were dissected. The shape and the length of descending duodenum, the shape and location of major duodenal papilla, and the inner diameter, outside diameter, wall thickness at the superior, inferior flexure duodenum and major duodenal papilla were observed respectively. Results The descendent duodenum shaped as vertical, curved or irregular. Most specimens showed the thin upper and thick lower parts, and the narrow part. The mucosa of longitudinal, sparse circular and flat folds could be observed separately. The average length of the descending duodenum was about (8.2±1.9) cm, and the inner diameter at the superior, inferior flexure duodenum and major duodenal papilla (4.8±1.7)cm,(5.8±1.3)cm, and (6.9±2.3)cm, respectively. The average outside diameter was (7.0±1.3)cm, (8.8±1.2)cm,(9.2±1.6)cm, respectively, and inner wall thickness (2.29±0.63)mm,(1.91±0.49)mm, and (1.75±0.73)mm, the outer wall thickness (1.63±0.53)mm, (1.42±0.37)mm, and(1.54±0.40)mm. The major duodenal papilla showed the irregular shape. The distance between the major duodenal papilla and the superior flexure duodenum was about(4.3±1.9) cm. Conclusions It is necessary to understand the anatomic features of descending duodenum for treating the diseases of this area.
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