肛管
**后管**是一组连接肛门和直肠与外部环境的解剖结构。它包括粘膜、粘膜下层、肌层和浆膜层。
解剖结构
后管的前缘穿过直肠大弯和小弯之间。根管壁包含以下几层： - 粘膜 * 外粘膜下膜 * 粘膜下层
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