DELIVERY IN THE RIGHT POSTERIOR MENTO ILIAC POSITION OF THE FACE.
The head descends with the forehead and chin nearly on a level, and the nose occupying the middle of the passage. When fairly in the cavity it rotates, the chin being brought under the pubes, while the back of the head passes into the curve of the sacrum. This is nearly always the process; no matter where the chin may be when the labor commences, it seldom fails to move under the pubes before it concludes. Occasionally it may rotate the other way, and pass into the hollow of the sacrum, while the occiput comes in front, but this is very rare.
The chin is born first, and then follows, below, the forehead, top of the head, and finally the occiput—the face turning upwards towards the mother's abdomen, as each part is successively delivered. When the head is fully born, the body rotates inside the same as in the head presentation, and the delivery concludes in precisely the same way.
PLATE XXXIV.
Fig. 1.
Fig. 2.
Fig. 1.—The chin just passed, in presentation of the face.
Fig. 2.—The head full born in presentation of the face.—p. The Pubic bone.—c. The Coccygis.