THE ISCHIAL-RAMIC DIAMETER
- 16 January 1926
- journal article
- research article
- Published by American Medical Association (AMA) in JAMA
- Vol. 86 (3) , 161-163
- https://doi.org/10.1001/jama.1926.02670290001001
Abstract
The knowledge of the ischial-ramic diameter has an important bearing on the proper conduct of labor. That portion of the pelvic cavity between the plane of the superior strait and a plane passed parallel through the ischial spines is a crude, heart-shaped cylinder in which the oblique diameters are greatest (Fig. 1). Near the end of the first stage of labor the presenting part is found in one of the oblique diameters, usually the right—a left occipito-anterior presentation. In this position the left parietal bone of the fetal head is in contact with the left ischial spine and the right parietal bone is in contact with the inner surface of the descending and ascending rami of the pubis and ischium (Fig. 2). In the usual presentation, the presenting part must be forced against the left ischial spine if there is any disproportion between the presenting part and this diameter. ANATOMYKeywords
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