Yeah - you got it wrong.  Hold you right hand up with your palm facing you.  Make a fist.  Stick up your middle finger.  Now stick out your thumb.  Now imagine your hand is not attached to your wrist - and you should see the basic shape.

I think everyone here should submit a picture for you to use in your posts.  And then you pick a winner.  I'll start -

Get it?  Mick.

Dan