Search Results for: Reptiles
vertebrates , the sclera is reinforced with plates of cartilage or bone , together forming a circular structure called the sclerotic ring . in primitive fish, this ring consists of four plates, but the number is lower in many living ray-finned fishes , and much higher in lobe-finned fishes , various reptiles
, and birds . the ring has disappeared in many groups, including living amphibians , some reptiles and fish, and all mammals . [ ] the eyes of all non-human primates are dark with small, barely visible sclera. histology[ edit ] the collagen of the sclera is continuous with the cornea . from outer to...
https://en.wikipedia.org/wiki/Sclera