Fig. 4

Three-dimensional image of AMF and MF. A, The position of the AMF relative to the MF (An; anterior, as; antero-superior, ai; antero-inferior, P; posterior, ps; postero-superior, pi; postero-inferior, S; superior, and I; inferior). B, The distance of the AMF to the MF (a; center of the AMF, m; center of the MF)