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The term comes from the Latin word nictare, meaning "to blink". It is often called a third eyelid or haw, and may be referred to in scientific terminology as the plica semilunaris, membrana nictitans, or palpebra tertia. Unlike the upper and lower eyelids, the nictitating membrane moves horizontally across the eyeball.
The plica semilunaris is a small fold of bulbar conjunctiva on the medial canthus of the eye.It functions during movement of the eye, to help maintain tear drainage via the lacrimal lake, and to permit greater rotation of the globe, for without the plica the conjunctiva would attach directly to the eyeball, restricting movement. [1]
Ajna (Sanskrit: आज्ञा, IAST: Ājñā, IPA: [ˈaːd͡ʑɲaː]), brow [1] or third eye chakra, is the sixth primary chakra in the body according to Hindu tradition and signifies the unconscious mind, the direct link to Brahman (ultimate reality). [2]
Taoism teaches that the third eye, also called the mind's eye, is situated between the two physical eyes, and expands up to the middle of the forehead when opened. Taoism asserts that the third eye is one of the main energy centers of the body located at the sixth Chakra , forming a part of the main meridian, the line separating left and right ...
Common misnomers include adenitis, hyperplasia, adenoma of the gland of the third eyelid; however, cherry eye is not caused by hyperplasia, neoplasia, or primary inflammation. [3] In many species, the third eyelid plays an essential role in vision by supplying oxygen and nutrients to the eye via tear production. [4]
The Third Eye, a British film by Maclean Rogers; The Third Eye or Il terzo occhio, an Italian film by Mino Guerrini; Third Eye, a Philippine horror film by Aloy Adlawan; The 3rd Eye, an Indonesian horror film The 3rd Eye 2, a 2019 sequel; Teesri Aankh, or The Third Eye, a 1982 Indian action-drama film
All geckos except those in the subfamily Eublepharinae (eyelid geckos) possess brilles. Some groups of bony fish have a transparent eyelid known as the adipose eyelid . [ 3 ] Some reptiles, mammals and birds have a translucent third eyelid that moves horizontally across the eye called the nictitating membrane .
An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the possession of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.