UNSW Embryology

Glossary Numbers

Glossary Links: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Link to the Original UNSW Embryology Glossary A

2D:4D

The ratio of 2nd and 4th finger (digit) length. This ratio has been suggested to relate to high fetal testosterone concentration (males have lower 2D:4D than females) and also thought to be an indicator of various neurological abnormalities.

(More? Neural Abnormalities | Endocrine Notes | McIntyre MH. The use of digit ratios as markers for perinatal androgen action. Reprod Biol Endocrinol. 2006 Feb 26;4:10.)