part_of part of part of bounding layer of develops from contributes to morphology of Homo sapiens external ectoderm epithelium cornea corneal epithelium http://upload.wikimedia.org/wikipedia/commons/6/66/Gray871.png In Humans: It consists of several layers of cells. The cells of the deepest layer are columnar; then follow two or three layers of polyhedral cells, the majority of which are prickle cells similar to those found in the stratum mucosum of the cuticle. Lastly, there are three or four layers of squamous cells, with flattened nuclei In zebrafish: nonpigmented, stratified squamous nonkeratinizing epithelial cells, attached to a thick basement membrane that is considered to be analogous to the Bowman's membrane in mammals neural crest-derived structure eye epithelium