The principles and practice of obstetrics . , is situatedin front of the other, and answers the same uses. It extends fromthe spinous process of the ischium to the sides of the sacrum andcoccyx. These two ligaments convert the ischiatic notch into twoforamina. The first is the larger, and gives transmission to thepiriformis muscle, the great ischiatic nerve, and also to the internalpudic nerves and vessels; while the second affords passage to theinternal obturator muscle, and internal pudic vessels and nerves. I shall next call your attention to one other articulation, viz. thesacro-vertebral.
The principles and practice of obstetrics . , is situatedin front of the other, and answers the same uses. It extends fromthe spinous process of the ischium to the sides of the sacrum andcoccyx. These two ligaments convert the ischiatic notch into twoforamina. The first is the larger, and gives transmission to thepiriformis muscle, the great ischiatic nerve, and also to the internalpudic nerves and vessels; while the second affords passage to theinternal obturator muscle, and internal pudic vessels and nerves. I shall next call your attention to one other articulation, viz. thesacro-vertebral. It results from the junction of the base of thesacrum with the lower articulating surface of the last lumbarvertebra. In the first place, the union is formed by a fibro-carti-lage, which is much thicker in front than posteriorly, and thisexplains in part the great prominence of this articulation ; secondly,there are various ligaments which contribute to its consolidation—the anterior and posterior vertebral ligaments, the inter-spinous,. Fig. 9. together with the sacro-vertebral ligament. In addition to thesethere are the ileo-lnmbar and ileo-vertebral ligaments. THE PRINCIPLES AND PRACTICE OF OBSTETRICS. 15 Relaxation of the pelvic articulations—their separation at thetime of labor.—In connexion with the pelvic articulations, an ex-tremely interesting question arises. Do these articulations, duringpregnancy, become relaxed, and, at the time of parturition, sepa-rate ; and, if so, is this separation required for the properly carry-ing out of the reproductive scheme? To show that this questionis not unimportant, I may mention that it has not only attractedthe attention of the learned in our science, but it has called forthearnest advocates both on the affirmative and negative side; andit, therefore, is, in the strict acceptation of the term, a debatablesubject. It was a favorite notion of the early fathers—and suchwas the belief entertained for a period of two thousand
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