A textbook of obstetrics . Fig. 215.— The rotation of the head being completed, its propulsion forward and outward I ig. 216. I lie passage of the head over the perineui MECHANISM OF PRESENTATIONS AND POSITIONS. 363 head, previously described, is not followed by the shoulders. Asthe former escapes from the vulva with the sagittal suture runninganteroposterior!}-, the neck is necessarily twisted. As soon asthe head is released from the forces which compel its rotation, it

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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics