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blink reflex |
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blink reflex
Etymology: ME, blenken + L, reflectere, to bend back the automatic closure of the eyelid when an object is perceived to be rapidly approaching the eye. blink the involuntary movement of one or both eyelids of both eyes simultaneously. The frequency varies between species. Cats blink the least, with the possible exception of owls. In birds it is the lower eyelid which is moved up to meet the upper lid. In mammals the upper eyelid is moved down to meet the lower lid. The blink is a part of several reflexes including the palpebral, conjunctival and menace reflexes. blink reflex see blink response. blink response absent in lesions of the ophthalmic branch of the trigeminal nerve. Called also blink reflex. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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