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Vertex presentations, classification

The vertex presentations are classified according to the position of the fetal occiput relative to the maternal pelvis. Top row (left to right): right occipito-anterior (ROA), straight occipito-anterior, left occipito-anterior (LOA). Middle row: right occipito-transverse (ROT), left occipito-transverse (LOT). Bottom row: right occipito-posterior (ROP), straight occipito-posterior, left occipito-posterior (LOP). Individual images by Mikael Häggström (2010). Montage by Douglas Lanska (2016). (Courtesy of Wikimedia Commons. Public domain.)

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