环肌，在食道组织中位于浆膜与结蹄组织的中央，是构成动物皮肌囊的一类肌肉组织。
咽壁的中层分为内侧发达的环肌和外侧较薄的纵肌两部分；
The results demonstrated that the pharyngeal wall consists of the three layers of structure including outer, middle and inner layer.
肌间神经丛、纵肌层、环肌层、黏膜肌层均可见大量SY免疫反应阳性产物。
SY immunoreactivity was abundant in the intermuscular plexus, longitudinal and circular muscle layers, and submucosal layer.
同一装置还可用于观察牵拉纵肌或扩张环肌所引起神经节细胞电活动的变化。
The preparation of the isolated IMG-colon and the apparatus used in this technique were also applicable in studying the effects of muscle stretch of the colon on the neuronal electrical activities.
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