Some doctors got themselves all in a hubbub over finding what they believe is nearly incontrovertable evidence that Raphael used polydactyl models.
Below is a detail from Raphael’s La Belle Jardinere. Doctors say the infant shows polydactylism.
I think artists call this foreshortening. And with some people that part of the foot sticks out more when standing than the pinky toe.
But physicians get extra credibility by discussing in terms like postaxial polydactyly of type A and hypothesizing on Raphael recruiting models from families who exhibit this autosomal dominant trait with variable expressivity.
I think artists call this sixth finger the palm of the hand.