Cornea 一 an avascular structure rich in free endings of sensory nerves consist of 5 layers: Free endings corneal epithelium anterior limiting lamina corneal stroma posterior limiting lamina corneal endotheliumCornea – an avascular structure – rich in free endings of sensory nerves – consist of 5 layers: corneal epithelium anterior limiting lamina corneal stroma posterior limiting lamina corneal endothelium