Experimental
detection of a cervical arousal mechanism of
yawning, enhancing intracerebral (CSF) fluid
pressure
Bouyssou M, Tricoire J
In 1982, FH Lepp discovered a rise in
cerebral fluid pressure on wide mouth opening
and ascribed it exclusively to a small
subcranial (subovular) venous pump which was
thought to suck up the venous blood out of the
skull according to Dumpert's
still prevailling ideas.
In 1912 Dixon had discovered that cervical
compression of jugular raises at once the
cerbro-spinal fluid pressure. Therefore it was
hyopthesized that wid mouth opening would
possibly act the same way by stretching the
omohyoïd muscles and thus equally sqeezing
the jugular veins.
Comparative electrical recordings of jugular
pressure above and below the omohyoïds on
"yawing" and at rest showed for the first time a
complete self strangulation of jugulars.
The same results was obtained and visualized
by means of serial jugular phlebography which
showed a sharply definied and complete
interruption of the jugular venous outflow from
he brain when the mouth wide open. The resulting
pressure rise in the upper jugular venous blood
is at once reflected in the cerebrospinal fluid
on the backward flow or pressure walve up to the
brain ventricles inducing an arousal of
cortex.
-Legendre
R, Piéron H.
De la propriété
hypnotoxique des humeurs
développée au cours d'une veille
prolongée C.R. Société de
Biologie de Paris 1912; 70; 210-212
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Tricoire J Experimental detection of a
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intracerebral (CSF) fluid pressure J Dental Res
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O Prostaglandines, adénosine, sommeil
& bâillements 2004
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Abretj Influence of dying gasps, yawns and
sighs on blood pressure and blood flow Am J
Physiol 1944; 142; 721-726
