环肌 meaning in Chinese

circular fibers
circular muscle
ring muscle

The stomach and intestine of naja naja can be divided into four layers , in order , they are mucous membrane , submucosa , lamina muscularis and fibrosa . the lamina muscularis of stomach is strong , the ratio of circular mucosae and longitudinal mucosae is 15 i 1
眼镜蛇胃肠道壁由内向外分四层，分别是粘膜层、粘膜下层、肌肉层和外膜，肌肉层分内环肌和外纵肌，胃的内环肌特别发达，内环肌和外纵肌厚度之比为15 ： 1 。