The axial plane is a transverse plane relative to a standing person.
If you decided to squeeze down a manhole in the pavement, then the pavement would be in an axial plane in relation to your body.
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3D knee segmentation based on three MRI sequences from different planes. Zhou L, Chav R, Cresson T, Chartrand G and de Guise J. Conf Proc IEEE Eng Med Biol Soc. 2016 Aug;2016:1042-1045. doi: 10.1109/EMBC.2016.7590881.