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As the stimulation of the vaso-motor nerves causes contraction of the blood-vessels, so their exhaustion or paralysis causes relaxation of these same vessels, consequently, over-distension with blood; and, if the door to hæmorrhage be once opened by the existence of the menstrual nisus, an excessive flow of blood. Such vaso-motor paralysis may depend on one of three circumstances: 1st.
It has been shown by Wright of Boston, that the coloration is due to stasis from mechanical over-distension of the veins and capillaries; actual extravasation into the tissues is exceptional.
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