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胃由胃底、胃体、胃窦三部分及贲门、幽门组成。近端胃(相当于胃底及胃体上部)具有储存食物的功能;远端胃(相当于胃体下部及胃窦)的主要功能为搅拌和碾碎食物。胃内液体的排空近端胃有两种收缩运动:1.缓慢的持续性收缩,保持胃内的基础压力。2.较快的周期性收缩,对胃内压力几乎无影响。当吞咽食物或胃被扩张时,通过对迷走神经的抑制,使持续性收缩减弱,胃腔扩大。这种所谓容纳性松弛使胃体上部可容纳较多的食物,而胃内压力无明显变化。胃内液体排空由胃、十二指肠之间的压力差控制。应用胃内压力计改变胃腔内压力的实
Stomach by the stomach, body, gastric antrum and cardiac and pylorus composition. The proximal stomach (equivalent to the fundus and the upper part of the body) has the function of storing food; the main function of the distal stomach (equivalent to the lower part of the body of the stomach and the antrum) is to stir and crush the food. Emptying of the stomach fluid There are two types of contractions in the proximal stomach: 1. Slow, sustained contraction that maintains the underlying pressure in the stomach. 2. Rapid cyclical contraction, almost no effect on gastric pressure. When swallowing food or stomach is dilated, through the inhibition of the vagus nerve, so that persistent contraction weakened, stomach cavity expansion. This so-called accommodative relaxation of the upper part of the body can accommodate more food, and no significant changes in gastric pressure. Gastric fluid emptying from the stomach, the pressure difference between the duodenum control. Application of intra-gastric pressure gauge to change the pressure in the stomach