trophospongia

troph·o·spon·gi·a

(trof'ō-spon'jē-ă), 1. Canalicular structures in the protoplasm of certain cells once thought to be instrumental in the circulation of nutritive material. 2. Vascular endometrium of the uterus between the myometrium and the trophoblast. [tropho- + G. spongia, a sponge]