Comparison between CV4 and EV4 - Osteopathic Research

23
through the middle tunica. Dilatory reactions therefore depend on a central
inhibition of this activity.
Sympathetic-cholinergic-vasodilatating fibres probably also exist in humans.
From the cortex going around the medulla oblongata, a vasodilatation occurs in
response to strong emotions such as anger or fear.
Parasympathetic cholinergic vasodilating fibres come from the VII., IX., X.
cerebral nerve and from the sacral marrow. Their switching occurs via the
postganglionary neurone either in or in immediate proximity to the effected
organ. They have no tonic base activity. A functional vessel innervating of
significance could only until now be demonstrated in the small pia arteries of the
brain, the coronary arteries and the genital organs. 23
A vasodilatation can also occur through stimulation of nociceptive afferent
neurones via mechanical or chemical stimulation of the skin.
Circulating hormones also influence the tone of peripheral vessels; however, this
mechanism only plays a secondary role.
2.4.4 Skin moisture
Skin moisture serves first and foremost the purpose of thermoregulation; it is
also an expression of man’s vegetative state of reaction. The sweat glands are
only regulated by sympathetic synapses in which acetylcholin is used as
transmitter. The sympathetic tone increases sweat glands secretion, thus skin
moisture.
23 SCHMIDT Robert et al: Physiologie des Menschen, 28. Auflage,
Berlin, Heidelberg, New York: Springer Verlag, 2000, p.525
Margit Grill / 2006