咀嚼胃 masticatory stomach

互联网2013-11-14

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　　亦称磨碎胃。系指具有咀嚼功能的特殊的胃。例如甲壳纲，特别是十足目的胃，在发生学上是前肠之一部分，因而上面覆盖着厚的几丁质层，该几丁质层在胃壁的一定部位成为显著的突起，向胃内腔突出，称为胃齿。藉肌肉的控制而磨碎胃内的食物。此外还指鸟的砂囊、寡毛纲的砂囊和昆虫的前胃等。

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