What system is the nictitating membrane in?
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Nictitating membrane. The nictitating membrane is a semilunar fold of conjunctiva, which also occurs in redimentary form in humans and non-human primates, that protrudes from the medial canthus and can extend over a significant portion of the cornea.
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The nictitating membrane, or “third eyelid,” is composed of T-shaped cartilage covered by conjunctiva that is continuous with the bulbar and palpebral conjunctiva on its inner and outer surfaces. The gland of the third eyelid, a seromucous gland, envelops the base of the cartilage.
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