The transparent anterior portion of the fibrous coat of the
eye consisting of five layers: stratified squamous CORNEAL
epithelium;
bowman membrane;
corneal stroma;
descemet membrane; and mesenchymal CORNEAL
endothelium. It serves as the first refracting medium of the
eye. It is structurally continuous with the
sclera, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the
trigeminal nerve via the ciliary nerves and those of the surrounding
conjunctiva which together form plexuses. (Cline et al., Dictionary of Visual
science, 4th ed)