The practice of obstetrics, designed for the use of students and practitioners of medicine . ition of completeextension (Fig. 539). These movements are believed to take place principallyin the cervical vertebras, the occipito-atlantoid articulation taking little or nopart in them. Antero-posterior motion in some instances certainly amountsto as much as 115 degrees. The term incomplete extension explains itself. THE FETAL HEAD. 413 Rotation.—The occipito-atlantoid articulation furnishes the mechanism fora very important movement—that of rotation; rotation that allows the vertexto move from one
The practice of obstetrics, designed for the use of students and practitioners of medicine . ition of completeextension (Fig. 539). These movements are believed to take place principallyin the cervical vertebras, the occipito-atlantoid articulation taking little or nopart in them. Antero-posterior motion in some instances certainly amountsto as much as 115 degrees. The term incomplete extension explains itself. THE FETAL HEAD. 413 Rotation.—The occipito-atlantoid articulation furnishes the mechanism fora very important movement—that of rotation; rotation that allows the vertexto move from one point inthe pelvis to another, and yet not necessarily re-quiring the shoulders to follow this movement. The question as to how greata degree of rotation of the head upon the spinal column may take place withsafety to the child has been the subject of much dispute among of them agree that rotation in the arc of a circle consisting of 90 degreesmay occur without any injury to the child (Fig. 539), and Tarnier even goes so far i »s #. EXTERNAL OCCIPITAL PROTUBERANCE. Pjq_ 237.—Diameters and Landmarks of the Fetal Skull. Inferior Surface. as to say that rotation in the arc of a semicircle may be made to occur withoutinjury. In this case the childs face would look directly backward over itsspinal column. From experiments with fetal cadavers I find that this rotationor torsion is not confined to any single point or joint, but is distributed alongthe upper spinal vertebra. Ninety-degree rotation of the fetal head durmglabor often occurs without injury to the neck. Fig. 539 is one of several pho-tographs of living children I have taken within an hour of delivery to provethe harmlessness of ninety-degree rotation of the fetal head. In the presentcase a hundred degrees was easily obtained. 414 PHYSIOLOGICAL LABOR.
Size: 1561px × 1600px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
