3 muscularis inner circular and outer longitudinal upper 1/3: skeletal muscle mdde1/3: mixed of|)的、张小管 上皮 skeletal M and E 出一固有层 粘膜肌层 smooth muscle · lower1/3: smooth 一粘膜下层 环行肌 muscle 5,;*:∵,一纵行肌 外膜 4)adventitia fibrosa3) muscularis: • inner circular and outer longitudinal • upper 1/3: skeletal muscle • middle 1/3: mixed of skeletal M and smooth muscle • lower 1/3: smooth muscle 4)adventitia: fibrosa