<prompt> Corneal endothelium is embryologically derived fromNeural crestEctodermMesodermEndoderm  <response>: Endothelium, Descemet;s membrane, stroma and Bowman;s layer are derived from the fibrous layer of mesenchyme lying anterior to the optic cup . The corneal endothelium is embryologically derived from the neural crest. The corneal endothelium is attached to the rest of the cornea through Descemet;s membrane, which is an acellular layer composed mostly of collagen IV. Reference : A K KHURANA Comprehensive Ophthalmology edition 4,page-8 