. Obstetrics for nurses. Fig. 63.—External rotation of the head—the sliouldershave assumed the antero-posterior position. (WiUiams.) 120 TEXTBOOK OF OBSTETRICS FOR NURSES. Fig. -The occiput rotated under the sjrmphysis—occiput anterior. (Williams.) and —Tho posteiior position of the occiput iiitvoducesan essential difference in tlie mecliauisni. xVs the occiput is directed toward one or the othersacro-iliac joints, ii isapparent that, in orderfor it to rotate to ,it must pass through anarc of 135° instead of45°. This greater rota-tion may slightly prolongthe second stage
. Obstetrics for nurses. Fig. 63.—External rotation of the head—the sliouldershave assumed the antero-posterior position. (WiUiams.) 120 TEXTBOOK OF OBSTETRICS FOR NURSES. Fig. -The occiput rotated under the sjrmphysis—occiput anterior. (Williams.) and —Tho posteiior position of the occiput iiitvoducesan essential difference in tlie mecliauisni. xVs the occiput is directed toward one or the othersacro-iliac joints, ii isapparent that, in orderfor it to rotate to ,it must pass through anarc of 135° instead of45°. This greater rota-tion may slightly prolongthe second stage of labor,but otherwise is of nopractical , internal rota-tion occurs when thehead reaches the perin-eum, but occasionally itis delayed until the scalpis in sight, when the whole process is visible. In about ten per cent of the cases, the occiput rotates posteriorlythrough an arc of 45° and comes to occupy the hollow of the sacrum. In such cases, spon- taneous delivery isusual, but the head isborn by a differentmechanism. Flexionpersists, and is evenexaggerated, until theocciput is pushed overthe perineum, then bya movement of exten-sion it
Size: 1783px × 1401px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectobstetrics, bookyear1
