pineal eye defined in 1951 yearpineal eye - pineal eye;
pineal eye - See also: Pineal apparatus. Pineal eye is a vesicle, formed as diverticulum of brain. In most complete form outer layer of vesicle becomes a lens (unlike vertebrate paired eyes, See also: Lens), inner layer a retina connected by nerve to brain. There is a gap in skull above the eye, and skin covering is almost transparent. Nerve however usually degenerates in adult reptile, though not in lamprey. Function unknown.
near pineal eye in Knolik
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