The wall of digestive tube was composed of mucous membrane, thin submucosa, tunica muscularis and tunica adventitia, but duodenal gland in duodenum was not found.
英
美
释义
消化壁一般分为4层,由内向外为粘膜、粘膜下层、肌层和外膜,其中粘膜下层很薄,十二指肠粘膜下层无十二指肠腺。
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