Which presentation is described accurately in terms of both presenting part and frequency of occurrence?
a. Cephalic: occiput; at least 95% c. Shoulder: scapula; 10% to 15%
b. Breech: sacrum; 10% to 15% d. Cephalic: cranial; 80% to 85%
ANS: A
In cephalic presentations (head first), the presenting part is the occiput; this occurs in 96% of births. In a breech birth, the sacrum emerges first; this occurs in about 3% of births. In shoulder presentations, the scapula emerges first; this occurs in only 1% of births.
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