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HEADACHES: THE AUTONOMIC NERVOUS SYSTEM
The muscle coats of blood vessels are supplied by nerves which, unlike those relaying pain sensations, have functions similar to those of nerves going to other muscle fibres; stimulation causes the muscle to contract and so narrow the blood vessels.
These particular nerves come from part of the nervous system which, because it deals with functions not usually under control of the conscious mind, is called the autonomic nervous system. This system is in two parts, the sympathetic and parasympathetic, each of which has different actions.
The sympathetic increases tension (tone) of the blood vessel walls, making them more resistant to increases in blood pressure; it also has effects on the heart, speeding its action, as well as on the circulation to other organs. It is the sympathetic system which takes over in situations of danger in the well-known ‘fight or flight’ situation. Activation of this system causes release of adrenalin from the adrenal gland, which then continues to have effects making the organism ready for action.
Stimulating the sympathetic system alters the blood vessel caliber with decrease of blood flow to the skin; this can also be altered by various techniques such as putting the hands in hot water, relaxation, or taking nitroglycerine (a drug used in treatment of angina since it dilates blood vessels and lowers blood pressure, thereby lessening the strain on the heart).
Other factors which control blood vessel diameter are local changes in the concentration of carbon dioxide and acidity, increases of which will cause the blood vessels to dilate. This is important for exercising muscles because, by producing lactic acid as a waste product, they increase the blood supply to the muscles.
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