NICTITATING MEMBRANE

is otherwise known commonly as the third eyelid is a thin fold of semi-transparent membrane which can be pulled across the eye independently of other eyelids. Nictitating membranes are typically observed in vertebrates.

NICTITATING MEMBRANE: "Some creatures, such as birds and cats have a nictitating membrane, which is a semi-transparent membrane which covers the eyes and can be moved independently from other eyelids."
Cite this page: N., Pam M.S., "NICTITATING MEMBRANE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/nictitating-membrane/ (accessed February 20, 2020).
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