epiphyseal eye

epiphyseal eye
a modification of the parapineal organ of certain lower vertebrates to form an eyelike structure lying subepidermally on the median dorsal aspect of the head; it is a photoreceptor rather than an image forming eye, enabling the organism to respond to darkness or to light. Called also parietal e., parietal body, and pineal e.

Medical dictionary. 2011.

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