Re: Potassium and Tears 2

J. Moore (
Fri, 17 Nov 95 09:22:00 -0500

In article <> (J. Moore)
>I think that emotional tears are likely to *not* be an early
>feature of hominids, due to the involvement of the frontal lobes
>in their production.

TC> Do you havea reference? I have never heard of this before.
TC> Studies on lobotomized patients? Phineas Gage?
TC> Tom Clarke

I forgot that in my posts on tears, I didn't get into innervation
much (since the issue there was the chemical nature of the tears
themselves rather than innervation). The reference for this
statement is:

1987 *Adler's Physiology of the Eye: Clinical Application*
Edited by Robert A. Moses, M.D. and William M. Hart, Jr., M.D., Ph.D.
Eighth edition. The C.V. Mosby Company: St. Louis, Washington, D.C.,
and Toronto.

Chapter 2: The lacrimal apparatus
by Benjamin Milder, M.D.

pg. 24:
"The anatomy of the nerve supply of the lacrimal gland is better
understood than is the function of each of the innervation
components. Peripheral sensory reflex tearing is certainly
mediated through the afferent fibers of the ophthalmic division of
the trigeminal nerve. However, central sensory reflex tearing
resulting from retinal stimulation is not as fully understood.
The pathways for psychogenic, or emotional tearing, weeping are not
clear, although the frontal lobes, the basal ganglia, and the
hypothalamus play a role. Whatever the stimulus to lacrimation,
the efferent pathway appears to be parasympathetic via the seventh
nerve fibers and the sphenopalatine ganglion."

Jim Moore (

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