胃幽门部幽门括约肌的组成A．由胃壁肌层内层的斜行肌增厚组成B．由胃壁肌层中层的环行肌增厚组成'C．由胃壁肌层外层的斜行肌增厚组成D．由胃壁肌...

作者: rantiku 人气: - 评论: 0

问题胃幽门部幽门括约肌的组成

选项 A．由胃壁肌层内层的斜行肌增厚组成 B．由胃壁肌层中层的环行肌增厚组成' C．由胃壁肌层外层的斜行肌增厚组成 D．由胃壁肌层内层的斜行肌及中层的环形肌增厚组成 E．由胃壁肌层内层的斜行肌及外层的纵行肌增厚组成

答案 B

解析：幽门部括约肌是由胃壁中层的环形肌在幽门部增厚形成。

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