You’d think that after 40+ years of life, there wouldn’t be a lot of undiscovered territory on body parts in as frequent use as my hands, but yesterday I discovered that I’m some kind of freakish throwback - don’t have fully opposable thumbs. :eek:
I’ve got quite stumpy, sausagy hands anyway, but I have no mobility at all of the joint between the metacarpal and phalange in both thumbs (yellow and green in the diagram on thispage). Never had.
If I bring my thumb inward across my palm to the fullest extent possible, I can’t reach as far as the base of my little(=pinky) finger, or oppose my thumb (either hand) against its tip. As a child, I couldn’t do the cub scout salute.
But I didn’t realise until yesterday that it’s because there’s essentially no joint at the base of my thumb - I discovered it by comparing my hands to my daughter’s (who does not appear to have inherited my style of hand). When she brings her thumb fully inboard, there is a distinct and angularly protruding knuckle at the base of her thumb - when I do it, all that happens is my palm tries to fold inward.
Is this common? Do you have it? Do you have stumpy hands too?