serosa
noun [ U ] medical specialized uk/sɪˈrəʊs.ə/ us/sɪˈroʊ.sə/ (also serous membrane)
浆膜，绒毛膜
a smooth membrane that lines body cavities and keeps them moist
The oesophagus has no serosa, thus reducing the resistance against local spread of invasive cancer cells. 食道没有绒毛膜，因此抵御进攻性癌细胞局部扩散的能力较低。