胃小区 胃小凹 上皮 胃小凹 固有层 胃底腺 粘膜肌层 粘膜下层< 1) Mucosa 肌层 plica-longitudinal KN s / 400m 6 -shallow ditch -gastric area(2-6mm gastric pit-small depressions1) Mucosa: ---plica-longitudinal ---shallow ditch- gastric area(2-6mm) ---gastric pit- small depressions