adjacent to adjacent to germ layer ectoderm mesectoderm MAT:0000243 A double row of cells which are located at the midline from the end of gastrulations. The morphology of these cells is distinct from adjacent ectodermal cells - they are elongated such that one end remains exposed to the outside of the embryo at the mideline while the other end bissects the internalised mesoderm. MIAA:0000243 Split term? The part of the mesenchyme derived from ectoderm, especially from the embryonic neural crest from which the pigment cells, meninges, and most of the branchial cartilages develop.[TFD] EFO:0003336 FBbt:00000136 MesEc mesectodermal UBERON:0000927