Winking


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Winking

 

(also nictitation), a protective unconditioned reflex (or a conditioned reflex formed on its basis) in response to stimulation of the sensory branches of the trigeminal nerve in the cornea or conjunctiva of the eye, in the skin of the eyelids, and in the eyelashes, as well as in response to light stimulation. The closing of the palpebral fissure before entry of a harmful agent into the eye is an important biological adaptation. During winking the eyeball is washed by lacrimal fluid, which helps remove foreign bodies. Winking is effected primarily by contraction of the orbital muscle, which is innervated by fibers of the facial nerve. In response to stimulation of the trigeminal nerve, the reflex arc is closed in the region of the medulla oblongata. Absence of winking is observed when the facial nerve is paralyzed or when the trigeminal nerve is damaged. Intensification and increase in the frequency of winking, often accompanied by tearing and photophobia, are observed with conjunctivitis.

References in periodicals archive ?
The 48-year-old Congress leader was seated just behind Thambidurai but it was not clear as to whom he was winking at.
Speaking to Gulf News, Varrier said she had never seen anyone winking in real life.
And 10 years later she appeared on the cover as one of i-D's winking models.
The winking cover girl became its signature from its fifth issue onwards, when Terry mocked up a winking Princess Di.
How to speak about the "natural increase" of the settlers without winking? How to speak about a Palestinian state without winking?
Against this demand, no winking a la Weisglass or verbal gimmicks a la Peres will be of any avail.
Although supported employment is often an integral part of adult service agencies, the divergence in role between those providing direct services on job sites and those providing vocational services within the agency (Winking et al., 1988), necessitates a consequent differentiation in training.
This finding appears tom differ somewhat from other role and function literature (Wehman & Melia, 1985; Winking et al, 1989), in which title differences for employment specialists are not necessarily accompanied by major role differences.
Jill said: "This winking shows that one is stepping into the realm of the forbidden."
This is one of the most ancient forms of winking as it used to tell people what to do.
New Delhi [India], July 23 ( ANI ): Bharatiya Janata Party's (BJP) Goa spokesperson Dattaprasad Naik on Monday came down heavily on Congress president Rahul Gandhi by describing him a `loafer` for winking in Parliament.
The winking fiasco is not the first time Rolstone has sparked controversy.