. The science and art of midwifery . ervix the degree of flexionis governed by the amount of pressure exerted by the cervical ringupon the frontal portion. In some instances this suffices to renderflexion complete—i. e., the chin sinks until arrested by contact with thechest; whereas, as is most often the case in multipara, the cervix maybe so softened and dilatable as to affect but slightly the direction ofthe occipitofrontal diameter. Most frequently the maximum degreeof flexion is occasioned by the convergence of the walls of the parturi-ent canal at the pelvic outlet. It is wrell for the b
. The science and art of midwifery . ervix the degree of flexionis governed by the amount of pressure exerted by the cervical ringupon the frontal portion. In some instances this suffices to renderflexion complete—i. e., the chin sinks until arrested by contact with thechest; whereas, as is most often the case in multipara, the cervix maybe so softened and dilatable as to affect but slightly the direction ofthe occipitofrontal diameter. Most frequently the maximum degreeof flexion is occasioned by the convergence of the walls of the parturi-ent canal at the pelvic outlet. It is wrell for the beginner to keep con-stantly in mind that flexion is not in any sense an active is always a movement of accommodation, the end of which is thesuccessive substitution of a shorter diameter for a previous longer one,so soon as the latter has encountered sufficient resistance to arrestits further progress. The mechanical advantages of flexion are obvious,when wTe recall that the average length of the sub-occipito-bregmatic. Pio. .».». Vertex presentation ; child surrounded by amniotic Quid. (Pinard.) or maximum diameter of the Hexed head (3j indies) is three quartersof an inch less than the oeeipito-frontal or maximum diameter of thehead when midway between extension and flexion. Again, the maxi-mum circumference of the flexed head (thirteen inches) is L| inch less than one measured about the extremities of the oeeipito-frontal diameter. These measurements, which are representative of the naturalstate, are, however, Ear from expressing the full extent of the diiTer-encea which exisl after the plastic head has undergone the moldingprocesses incident to labor. MECHANISM OF LABOR. ] 7:; A further advantage of flexion is thus described by Professor Pajot :The foetus, in its entirety, is to be regarded as a broken, vacillatingrod, possessed of mobility at the articulation of the head and trunk ;but a solid thus disposed presents conditions unfavorable to the trans-missio
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