A manual of practical obstetrics . Rotation and delivery of shoulders. 11. Delivery of Head—the occiput fixing itself behind thepubic symphysis, the back of the childs neck under the pubicarch, while chin escapes first at perineum, followed succes-sively, by mouth, nose, forehead, biparietal equator, and lastof all the occiput itself, which sweeps along curve of sacrum. Mechanism in Right Sacro-anterior Position (Sacrumto Right Acetabulum).—Moulding, descent, and rotation ofthe breech. The hip nearest the pubes rotating to the pubes,the one nearest the sacrum to the sacrum. Delivery of thebree
A manual of practical obstetrics . Rotation and delivery of shoulders. 11. Delivery of Head—the occiput fixing itself behind thepubic symphysis, the back of the childs neck under the pubicarch, while chin escapes first at perineum, followed succes-sively, by mouth, nose, forehead, biparietal equator, and lastof all the occiput itself, which sweeps along curve of sacrum. Mechanism in Right Sacro-anterior Position (Sacrumto Right Acetabulum).—Moulding, descent, and rotation ofthe breech. The hip nearest the pubes rotating to the pubes,the one nearest the sacrum to the sacrum. Delivery of thebreech. The hip nearest the sacrum coming out first at theperineum. 212 BREECH FOOT PRESENTATIONS. Descent and rotation of the shoulders—the shoulder nearestthe pubes rotating to the pubes, the one nearest the sacrum tothe sacrum. Delivery of the shoulders—the one at the sacrumcoming out first over the perineum. Fig. Anterior rotation of occiput. Flexion, descent, and rotation of the head—the occiput (nowat the right acetabulum) rotating on the right anterior inclinedplane to the pubes, the forehead to the sacrum. Delivery ofthe head—chin, mouth, nose, forehead, biparietal equator, andlastly occiput, successively escaping over perineum. Mechanism in Left Sacro-posterior Position (Sacrumto Left Sacro-iliac Synchondrosis).—Moulding, descent,rotation, and delivery of the breech; and descent, rotation,and delivery of the shoulders exactly as already described for<interior positions of the sacrum. Flexion and descent of the head are also the same, exceptthat the occiput enters the pelvis directed toward the left sacro-iliac synchondrosis instead of toward one of the rotation of the occiput takes place, in the majority of LEFT SACRO-POSTERIOR POSITION. 213 cases, all the way round to the symphysis pubis, when the restof the mechanism is the same as just described for anteriorpos
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