Fig. (1) Schematic diagram showing the anatomy of the most anterior neural retina and ciliary body of the adult human eye. A non-laminated region, similar to that seen in fish and amphibians and known as the ciliary marginal zone (CMZ) is present in fish and amphibians throughout life [33-36]. A similar region has been identified in the early postnatal life of avians [38] and rodents [55], as well as in young primates [22] and human adults [25].