part_of starts_at ends_at anal region cloacal membrane EMAPA:16832 The cloacal membrane (clmem) (TS:16-TS:20) is the part of the cloaca where the two different epithelia of the surface ectoderm (of the embryo) and cloacal epithelium are in direct contact with each other. Comprised of cloacal epithelium of cloacal membrane and surface ectoderm of cloacal membrane. Fgf8 marks the cloacal epithelium component. (Note: the cloacal membrane is distinct to the urogenital membrane, which is comprised of the regions of surface ectoderm and urethral plate epithelium in contact with each other and part of the genital tubercle). anatomical_structure cloaca TS16 TS20