in·fun·dib·u·lum 
(ĭn′fən-dĭbyə-ləm)
(ĭn′fən-dĭbyə-ləm)n. pl. in·fun·dib·u·la (-lə)
Any of various funnel-shaped bodily passages, openings, structures, or parts, especially:
a. The stalk of the pituitary gland.
b. The calyx of a kidney.
c. The ovarian opening of a fallopian tube.
[Latin, funnel, from īnfundere, to pour in; see INFUSE.]
in′fun·dibu·lar (-lər), in′fun·dibu·late′ (-lāt′, -lĭt) adj.