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Tears are a liquid produced by the body's process of lacrimation to clean and lubricate the eyes. The word lacrimation may also be used in a medical or literary sense to refer to crying.
Physiology
In humans, the tear film coating the eye has three distinct layers:
- The mucous layer contains mucin secreted by the conjunctival goblet cells. The inner-most layer of the tear film, it coats the cornea to provide a hydrophobic layer that allows for even distribution of the aqueous layer.
- The aqueous layer contains water and other substances such as proteins (e.g. tear lipocalin, lactoferrin and lysozyme*) secreted by the glands of Kraus and Wolfring and the lacrimal gland.
- The lipid layer contains oils secreted by the Meibomian glands. The outer-most layer of the tear film, it coats the aqueous layer to provide a hydrophobic barrier that retards evaporation.
One lacrimal gland is located above and beside each eye, behind the upper eyelid. The lacrimal glands secrete lacrimal fluid which flows through lacrimal ducts into the space between the eyeball and lids. When the eyes blink the lacrimal fluid is spread across the surface of the eye. Lacrimal fluid gathers in the lacrimal lake, then flows via the puncta through the lacrimal canaliculi at the inner corner of the eyelids through the nasolacrimal duct, and finally into the nasal cavity. An excess of tears, as with strong emotion, can thus cause the nose to run.
More on [ Tears ]
Most of those reality shows out there are fake, the excessive crying by judges and all..oh come on ..what will they loose after all?
sujithdan (sujith mammen) Sat, 07 Nov 2009 20:47:06 -0000
Most of those reality shows out there are fake, the excessive crying by judges and all..oh come on ..what will they loose after all?
@LabelsThatTweet Not complaining, more like "excessive commentary" :D p.s. i hate crying babies, that is all.
gypsyraven (Gypsy Raven) Sat, 07 Nov 2009 02:27:23 -0000
@LabelsThatTweet Not complaining, more like "excessive commentary" :D p.s. i hate crying babies, that is all.
RT @huffingtonpost: New App Translates Crying Babies http://bit.ly/ANfAY -- seems excessive...I'd think a parent could do just as well. #fb
splashmary (Emily Sidley) Thu, 05 Nov 2009 22:02:37 -0000
RT @huffingtonpost: New App Translates Crying Babies http://bit.ly/ANfAY -- seems excessive...I'd think a parent could do just as well. #fb
I'm crying cos of excessive laughing. Holyshit, my day went from horrendous to EPIC. http://bit.ly/15RjG0
crissysales (Crissy Sales) Tue, 03 Nov 2009 16:34:18 -0000
I'm crying cos of excessive laughing. Holyshit, my day went from horrendous to EPIC. http://bit.ly/15RjG0
WOW! VERY INTERESTING RT @that_danielle Please read this by @AskDrSears abt Excessive Crying http://bit.ly/2u1I5m #parenting
ChristiRamirez (Christi Ramirez) Tue, 03 Nov 2009 15:31:50 -0000
WOW! VERY INTERESTING RT @that_danielle Please read this by @AskDrSears abt Excessive Crying http://bit.ly/2u1I5m #parenting
.@ChristiRamirez @JGDubU Please read this by @AskDrSears abt Excessive Crying http://bit.ly/2u1I5m #parenting
that_danielle (Danielle Friedland) Tue, 03 Nov 2009 15:25:16 -0000
.@ChristiRamirez @JGDubU Please read this by @AskDrSears abt Excessive Crying http://bit.ly/2u1I5m #parenting
Baby Crying Excessively - Guide for parents by a family doctor.
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Evaluation and Intervention in Excessive Crying in Infancy - Overview presented by the Kansas Association for Infant Mental Health.
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MedlinePlus Medical Encyclopedia - Information on causes of excessive crying in infants, advice and treatment.
The Effect of Excessive Crying on the Development of Emotion - Study published in Infancy.
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