An hexagonal, flattened, mitochondria-rich endothelial cell that forms a monolayer on the posterior surface of the cornea (the corneal endothelium). Corneal endothelial cells are derived from the neural crest and are responsible for keeping the cornea transparent by maintaining the tissue in a semi-dry state through the action of their ionic pumps and tight junction barrier. [ MESH:A09.371.060.067.31 http://www.ncbi.nlm.nih.gov/pubmed/36769303 http://www.ncbi.nlm.nih.gov/pubmed/23284695 http://www.ncbi.nlm.nih.gov/pubmed/34741068 GOC:tfm http://www.ncbi.nlm.nih.gov/pubmed/21976958 ]