Which of the following presentations is described accurately in terms of both presenting part and frequency of occurrence?
1. Cephalic: occiput; at least 95%
2. Breech: sacrum; 10% to 15%
3. Shoulder: scapula; 10% to 15%
4. Cephalic: cranial; 80% to 85%
1
1. Correct. In cephalic presentations (head first) the presenting part is the occiput, occurring in 96% of births.
2. Incorrect. In breech birth the sacrum is out first, representing about 3% of births.
3. Incorrect. In shoulder presentations the scapula is out first; they occur only in 1% of births.
4. Incorrect. In cephalic the part of the head or cranium that is out first is the occiput. These presentations occur in 96% of births.
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