. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. mnii, and, when seen in a pure state, it is duesolely to the action of the longitudinal and not at all tothat of the circular fibres. It is felt clinically as a mere ridge in the uterine wall,is in no sense a constriction-ring, and, like the generalretraction of adry uterus, it isthe necessary re-sult of exhaus-tion of the ute-rine muscle by atoo long contin-uance of laborin the face of anobstacle. 11 increasesthe dangers, butin itself does notincrease the diffi-
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. mnii, and, when seen in a pure state, it is duesolely to the action of the longitudinal and not at all tothat of the circular fibres. It is felt clinically as a mere ridge in the uterine wall,is in no sense a constriction-ring, and, like the generalretraction of adry uterus, it isthe necessary re-sult of exhaus-tion of the ute-rine muscle by atoo long contin-uance of laborin the face of anobstacle. 11 increasesthe dangers, butin itself does notincrease the diffi-culties, of ver-sion. On the otherhand, the spas-modic hour-glass constric-tion-ring of anirritable and ir-regularly con-tracted uterus(Fig. 4570),though it mayoccur, as is some-times seen, in auterus with un-broken mem-branes, is common only after a more or less completeescape of the waters. It is the result of an irritablerather than of an exhausted uterus, and, though it ismost common after the uterine muscle has become tired,may occur at a very early stage of labor. ft is due to the action of the circular fibres alone ; it. Fig. 457(1.—Constriction Ring about the Neck. 633 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. increases both the dangers and the difficulties of version,and may even clasp the child so closely as to make theoperation an impossibility. Its most common situationis about the neck of the child, but it may occur in an)rhorizontal zone of the uterus. The retraction of a dry uterus upon the child, if pres-ent in a marked degree, is almost always complicated bythe coexistence of the retraction-ring of Bandl, and, inany degree, is usually accompanied or preceded, espe-cially in head-presentations, by one, or several, more orless localized circular constrictions or constriction-rings. The dangers of version are so greatly increased by thepresence of any one or all of these conditions that theearly diagnosis of their approach is a matter of the h
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