AP diameter:
Suboccipitobregmatic 9.5 cephalic (well-flexed)
Transverse diameter:
Biparietal: 9.5cm
Bitemporal: 8cm
Internal rotation probably occurs as the fetal head meets the muscular sling of pelvic floor, it is often not accomplised until presenting part has reached the level of ischial spine (zero station) and is therefore engaged.
engaged= 2/5 palpable on abdomen = zero station descent at ischial spine.
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