A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . afterward the two segmentsabove and below unite; •when union of these two latteifails to take place, the interparietal bone is formed. Therecent line of union shows very well in the skull of thenew-born. Cuvier, Milne-Edwards, Geotfroy St. Hilaire,and the other writers aheady mentioned, insist that a dis-tinction should be made between the interparietal boneMild the large fragments occurring in the posterior fonta-nel, which are the true Wormian bones. Anoutchune,in
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . afterward the two segmentsabove and below unite; •when union of these two latteifails to take place, the interparietal bone is formed. Therecent line of union shows very well in the skull of thenew-born. Cuvier, Milne-Edwards, Geotfroy St. Hilaire,and the other writers aheady mentioned, insist that a dis-tinction should be made between the interparietal boneMild the large fragments occurring in the posterior fonta-nel, which are the true Wormian bones. Anoutchune,in his researches, made the following divisions in stim-luing up his percentages: 1. Complete: Os Incas, or interparietal bone. 2. Incomplete: The os bi-, tri-, or quadripartitum, or,in other words, theepactal bone, os triquetrum, os quad-ratum. 3. Os lambdoideum. It will therefore be seen that these bones may be singleor multiple; even as many as eight having been observedby one writer quoted by Geoifroy St. Ililaire. The effect of Wormian bones occurring in fontanelsat childbirth, and the relation which these bear to the. -Skull from a Breton, showing Interparietal ) (After moulding of the skull at that time, are questions whichhave received some consideration by the author of thispaper. The possibility that such bones, if of considerable sizeand if they occurred in the posterior fontanel, might exerta detrimental, if not fatal, influence, ?was suggested bythree eases which came under observation at the liospitalof the New York Infirmaiy for Women and histories of the three cases were almost mothers were all primipara. There was nothingabnormal in the measurements, either of tlie pelves ofthe mothers, or of the heads of the infants. The pre-sentations were all of them the usual left anterior oc-cipito-iliac. The labors progressed slowly but normallythrough tlie first stage, but the second stage was veryslow, lasting between two and thr
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