A textbook of obstetrics . -, the neck is necessarily twisted. As soon asthe head is released from the forces which compel its rotation, it. Fig. 217.—Birth of the shoulders. Frozen section </??-? immediately resumes its natural relationship with the shoulders,which lie with their long axis in the oblique diameter ot thepelvis. 364 7 HE MEt II. 1NISM OF L,1BOR. Eighth Step.— External rotation. This movement of the head is explained by the movement of the shoulders within thebirth-canal. Ninth Step.—Descent, rotation, and birth of shoulders. The anterior, or right, shoulder first strikes the
A textbook of obstetrics . -, the neck is necessarily twisted. As soon asthe head is released from the forces which compel its rotation, it. Fig. 217.—Birth of the shoulders. Frozen section </??-? immediately resumes its natural relationship with the shoulders,which lie with their long axis in the oblique diameter ot thepelvis. 364 7 HE MEt II. 1NISM OF L,1BOR. Eighth Step.— External rotation. This movement of the head is explained by the movement of the shoulders within thebirth-canal. Ninth Step.—Descent, rotation, and birth of shoulders. The anterior, or right, shoulder first strikes the resistance ofthe pelvic floor. In obedience to the universal law alreadyenunciated, that whatever portion of the fetal body first encoun-ters this resistance is directed downward, forward, and inward,the anterior shoulder is compelled to travel in these directionsby a rotary movement of the shoulders on the spine. The anterior shoulder finally appears under the arch of thesymphysis ; unable to move further forward, the posteriorshoulder and arm are propelled over the floor of the pelvis andare born, their escape being fol
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
