A textbook of obstetrics . to be adepression on that portion of the skull applied t the promontory—namely, on the posterior parietal bone between the greaterfontanel and the parietal eminence, usually quite close to the ANOMALIES IN THE FORCES OF 427 sagittal suture (Fig. 284). Sometimes a succession of thesedepressions or a gutter-shaped groove may be noted in a linerunning outward and forward on the childs skull. More fre-quently the course of the head and face over the promontory ismarked by a red streak running from the depression before notedin a line parallel with the coronal su
A textbook of obstetrics . to be adepression on that portion of the skull applied t the promontory—namely, on the posterior parietal bone between the greaterfontanel and the parietal eminence, usually quite close to the ANOMALIES IN THE FORCES OF 427 sagittal suture (Fig. 284). Sometimes a succession of thesedepressions or a gutter-shaped groove may be noted in a linerunning outward and forward on the childs skull. More fre-quently the course of the head and face over the promontory ismarked by a red streak running from the depression before notedin a line parallel with the coronal suture toward the temple if thehead is well flexed after engagement, or to the outer corner of theposterior eye, or, in case o{ extreme flexion, to the cheek (, A, B, C). Usually the posterior parietal bone is depressedbelow the anterior, which overlaps it at the sagittal suture. Theposterior side of the skull is also flattened from the greater andmore prolonged pressure to which it is subjected. Ordinarily. Fig. 284.—Depression in the parietal bone caused by the pressure of thepromontory (Winckel). the lateral inclination of the childs head is in a direction frombefore backward, so that the anterior parietal bone presents at thecenter of the superior strait. Occasionally this inclination is soexaggerated that the ear is the presenting part. Exceptionallythe lateral inclination takes the opposite direction, the anteriorparietal bone catches on the rim of the pubic bones, and theposterior parietal bone is the first portion of the childs head toenter the pelvis. The presentation of the posterior fontaneloccurs even in normal pelves as a rare exception, but is seen inabout ten per cent, of contracted pelves (Schauta), and is theresult in them very likely of firm abdominal walls and anincreased inclination of the pelvic inlet to the axis <A the trunk. 428 THE PATHOLOGY OF LABOR. In these cases the anterior parietal bone is pushed under theposterior at the sagittal sutur
Size: 1760px × 1420px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
