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In fractures of middle cranial fossa absence of tears is due to lesions in which nerve and why?
Wiki User
∙ 15y ago
The lacrimal gland produces tears in response to parasympathetic stimulation by the greater petrosal nerve. The greater petrosal is nothing more than a renaming of the parasympathetic fibers contributing to the facial nerve after it exits the internal acoustic meatus. It is this opening in the temporal bone that might be damaged in a cranial base fracture, and might also involve a lesion to the greater petrosal nerve. This would also cause an absense of tear formation. If you want to know more, wikipedia has an excellent discussion of the cranial nerves, and here is a link to the facial nerve page: http://en.wikipedia.org/wiki/Facial_nerve Hope that helps!
Wiki User
∙ 15y ago
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