hilum       
noun [ C ]  medical specialized uk/ˈhaɪ.ləm/ us/ˈhaɪ.ləm/  hila /ˈhaɪ.lə/ /ˈhaɪ.lə/ (also hilus)
 (拉丁语,用于医学术语,血管和神经进入器官的凹陷处的通称)门
a hollow or narrow opening in an organ through which nerves, blood vessels, and tubes enter and leave
  the renal hilum 肾门