4-3-消化管2(咽-肛管-雙語版)-在線瀏覽
2024-10-04 00:58本頁面
【正文】 res – Lesser curvature of stomach ? short, concave and directed to the right and upward ? near its lower part is angular incisure – Greater curvature of stomach ? long, convex and directed to the left and downward ? at the junction of left margin of esophagus and greater curvature is cardiac incisure ? Two openings – Cardia – Pylorus ? Two incisure 第十頁，共四十五頁。 Stomach Cardiac part Fundus of stomach Body of stomach Pyloric antrum Pyloric canal Pyloric part 第十二頁，共四十五頁。 Structure of stomach wall － consists of four usual layers ? Mucous membrane ? Submucous ( loose areolar tissue connecting the mucous and muscular layer) ? Muscular layer contains: – Innermost oblique fibres – Inner circular fibres ? Sphincter of pylorus ? Pyloric valve – The most superficial longitudinal fibers ? Serous (visceral peritoneum) Stomach 第十四頁，共四十五頁。 Duodenum ? first and widest part of small intestine ? extends from pylorus to duodenojejunal flexure ? approximately 25cm long and 45 cm in diameter ? Cshaped and moulded around head of pancreas ? retroperitoneal, except for a small segment (13 cm) at the beginning ? mon bile duct and pancreatic ducts－ open into the second part General features 第十六頁，共四十五頁。 ? Descending part – Longitudinal fold of duodenum – Major duodenal papilla ? mon opening of the mon bile duct and pancreatic duct ? 75cm from incisors – Minor duodenal papilla Duodenum 第十八頁，共四十五頁。 Jejunum and ileum 第二十頁，共四十五頁。 ? Meckel’s diverticulum – Persistence of proximal portion of yolk sac – Common malformation of digestive tract (2－ 4%) ， more prevalent in males – About 2－ 5cm long and located 30－ 100cm from ileocecal valve – Usually asymptomatic but: ? May bee inflamed (mimicking appendicitis) or bleed Jejunum and Ileum 第二十二頁，共四十五頁。 ? Colic bands ? Haustra of c
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