The Alimentary SystemⅡ

张 正 洪 副教授

Yunyang Medical College Composition Mouth Digestive tube 消化管 Pharynx

• oral cavity Esophagus • Pharynx Major salivary glands • Esophagus Duodenum Stomach • Stomach Liver • Small intestine Jejunum Ileum Pancreas Duodenum • Large intestine Digestive glands 消化腺 Large intestine • Major salivary glands唾液腺 肝 Jejunum • Liver Ileum • Pancreas 胰 The Stomach 胃

The stomach is a mascular capsule ,and it is the most dilated portion of the alimentary canal,and is situated between the end of the esophagus and the beginning of the small intestine. The Stomach 胃 Shape  Two surfaces: anterior and posterior

 Two curvatures两个弯曲 Lesser curvature 胃小弯 : angular incisure 角切迹 Greater curvature 胃大弯

 Two openings Cardia 贲门 Pylorus 幽门 Fundus of Parts of stomach stomach 胃底

Cardiac part 贲门部 Cardiac part 贲门部 Fundus of stomach 胃底 胃体 Body Body of stomach of stomach Pyloric part 幽门部 胃体

 Pyloric antrum 幽门 Pyloric canal 幽门管 Pyloric antrum 幽门窦 窦 Pyloric part 幽门部  Pyloric canal 幽门管 Position －Main parts is situated in the left hypochondriac region, small in the epigastric region; the cardia is

situated in the left of T11, the pylorus lies in the

right of L1 The Small Intestine小肠

 It extends from the pylorus to the ileocecal

orifice,and it is About 5- Duodenum 7m long.

 Be divided into

 Duodenum 十二指肠 Ileum Jejunum  Jejunum 空肠

 Ileum回肠 Duodenum十二指肠 It is the shortest,widest and most fixed part of the small intestine,and is about 20-25cm long. Position and shape It lies on the posterior abdominal wall (L1- L3) ,and likes a C-shape which enclose the head of the pancreas Four parts  Superior part Duodenal bulb 十二指肠球  Descending part Longitudinal fold of duodenum Major duodenal papilla 十二指肠大乳头  Horizontal part  Ascending part duodenojejunal flexure 十二指 肠空肠曲

Suspensory muscle of duodenum十 二指肠悬肌 (ligament of Treitz) Jejunum and ileum 空肠和回肠 The upper 2/5 of this part of small intestine is called jejunum and the lower 3/5,ileum.