A textbook of obstetrics . 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
A textbook of obstetrics . 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. Fig. 210.—Left occipitoanterior position of a vertex presentation. methods of examination in the position and presentation underdiscussion the fetal back is found to the left, the extremities tothe right and above, the head below ; the heart-sounds are heardmost distinctly about an inch below and to the left of the umbili-cus ; the examining finger in the vagina detects the vertex pre-senting, with the occiput directed toward the left acetabulum ; thesagittal suture is in the right oblique diameter of pelvis ; thesmaller fontanel, recognized by the junction of the lambdoidaland the sagittal sutures as the most dependent portion of thepresenting part, and the tip of the occipital bone, overlapped bythe parietal bones. As the direction or axis of the pelvic canaldiverges from that of the uterine cavity, running, at first, more 358 THE MECHANISM OF LABOR. posteriori}, there is usually a lateral inclination of the head sothat the sagittal suture is posterior to the normal position ofthe
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
