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Old 12-01-2013
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Question Tearing in Facial Nerve Injury!

According to uworld bell's palsy cause decrease tearing but HY Neuroanatomy says facial nerve lesion (feature of bells palsy) cause CROCODILE TEARS means excessive tearing...
please explain
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Old 12-01-2013
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Source: Wikipedia ('Crocodile Tears')
The phrase gives its name to Bogorad's syndrome, colloquially "crocodile tears syndrome", an uncommon consequence of recovery from Bell's palsy where faulty regeneration of the facial nerve causes sufferers to shed tears while eating.
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Default Explanation

Okay .. Let me explain it to you ..
Facial nerve carry Pre-Ganglionic Parasympathetic nerve fibers to the Lacrimal Gland .. once the facial nerve is injured proximal to the site where these fibers leave the nerve , there will be no lacrimation ... after the injury to the nerve , the fibers reconnect , Crocodile tears occur when there is a mal-reconnection , so the lacrimal fibers connect to the muscular fibers and vice versa , so when the patient tries to eat he will lacrimate .. hope that would help you .
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The above post was thanked by:
DrJZ (12-02-2013), krazzyrj (01-30-2016), medicalbiology (12-01-2013), meilocat (12-03-2013), v195 (12-30-2013)



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