Trophectoderm that surrounds the inner cell mass (ICM). [ ]

This is just here as a test because I lose it

Term information

database cross reference

emapa_ehdaa2, early_development

development notes

unlike mural trophectoderm cells which stop proliferating and become large polyploid cells (the primary trophoblastic giant cells) by endoreduplication, polar trophectoderm cells remain diploid, continue to proliferate and give rise to both the ectoplacental cone and the extraembryonic ectoderm[MP]

external definition

The part of the trophectoderm overlying the inner cell mass. [See_Kaufman_MH_and_Bard_JBL, The_anatomical_basis_of_mouse_development_(1999)_San_Diego:_Academic_Press, p.10][VHOG]

has related synonym

polar trophoblast

homology notes

(...) the trophoblast develops rapidly so that contact may be made with the maternal uterine tissues when conditions are appropriate. We have here an excellent example of an embryonic adaptation, the development of a structure never present in either adult or embryo of 'lower' vertebrates.[well established][VHOG]