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April 30, 1955

The Mechanism of Labour

JAMA. 1955;157(18):1662. doi:10.1001/jama.1955.02950350076038

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By the use of modeled heads and the old Sellheim curved birth canal the author has attempted to show that the shape of the head is the principal reason for internal rotation. He has used motion pictures to show the behavior of the head during external rotation and also the delivery of the shoulders. He reviews the work of Sellheim and of James Young and disagrees with their theories as to the cause of these movements. The text is not too clearly written, probably partly because of language difficulties. Little of value is added to our knowledge of the subject, and, for the use of the average American student, the information in standard textbooks is probably more easily understandable and available. The author uses words loosely referring to "the cranial portion of fetal vertebral column" and says it is "straight or lordotic." Lordosis, as we understand it, is one form

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