Human 2D (index) and 4D (ring) digit lengths: their variation and relationships during the menstrual cycle.

@article{Mayhew2007Human2,
  title={Human 2D (index) and 4D (ring) digit lengths: their variation and relationships during the menstrual cycle.},
  author={Terry M. Mayhew and Linda D. Gillam and Robert McDonald and Francis J P Ebling},
  journal={Journal of anatomy},
  year={2007},
  volume={211 5},
  pages={630-8}
}
It is known that there are sexually dimorphic differences in relative and absolute lengths of the index (2nd) and ring (4th) fingers and that the sizes of laterally-paired soft tissues (e.g. ears and fingers) show changes across the menstrual cycle. The aim of the present study was to determine whether cyclical changes in the digit lengths of the index and ring fingers also occur and, if so, to what extent these are related to changing patterns of circulating sex steroids. Digit lengths were… CONTINUE READING
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