Identifier: textbt00hirs (find matches)
Title: A textbook of obstetrics
Year: 1899 (1890s)
Authors: Hirst, Barton Cooke, 1861-1935
Subjects: Obstetrics
Publisher: Philadelphia : Saunders
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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ipital bones. These bones are separatedfrom each other as follows : The two frontals by the frontalsuture, the frontal from the parietal by the coronal suture, thetwo parietal by the sagittal suture, and the two parietal fromthe occipital by the lambdoidal suture. At the junction ofthe lambdoidal and the sagittal sutures there is a membranousspace, called the posterior fontanel, triangular in shape. At thejunction of the frontal, coronal, and sagittal sutures there isalso a membranous space, called the anterior fontanel, kite-shaped, and larger than the posterior fontanel. This portionof the skull, the cranium, yields to pressure, and is reduced insize by an overlapping of the bones. The unyielding portion of tin- skull comprises tin- face andthe base of the skull. The bones of this region are fixed andunyielding. A transverse vertical section of the skull is somewhat wedge-shaped, the wedge tapering toward the neck. A longitudinalmedial section is distinctly conical in form. PLATE 7-
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Fetal skull seen from the side, (2) from above, (3) from behind, and \) from in front,showing sutures, fontanels, and diameters. MECHANISM OF PRESENTATIONS AND POSITIONS. 357 Possible Presentations of the Head.— Vertex. — By this term ismeant that conical portion of the skull with its apex at thesmaller fontanel and its base at the planes of the biparietaland trachelobregmatic diameters,—the face; the brow; thelarger fontanel; the parietal eminence ; the car. THE MECHANISM OF THE SEVERAL PRESENTATIONS AND POSITIONS. The Mechanism of Labor in a Vertex Presentation and aLeft Occipito=anterior Position.—It is convenient to begin thestud\- of each presentation with a consideration of its diagnosis. The diagnosis of position and presentation is made by abdom-inal palpation, auscultation, and vaginal examination. By these

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