Tupuxuara has four metacarpals. One for each finger. The fourth finger, of course, has a larger one. This post is about metacarpal #4.
We only have four views of each one. Very good pictures, but no distal and proximal views of the bone ends. So I have to guess what they look like from the pictures.
The bone shafts are somewhat cone shaped, a bit flat on one side, narrow and rounded near one end (distal) and triangular at the other end (proximal). I started with a sheet of 5 mm foam for each one.
Folded and twisted until I could roll it into shape.
Rolled it. Held everything in place with rubber bands. Then I made the bone ends with thicker (3 cm) XPS foam. I made the shaft slightly longer so I could insert it into the wheel-shaped distal end.
When they were dry, I did some trimming, shaping and texturing with a knife and a lighter.
And this is the result. Four views. The pencil is 16 cm long.
This is the distal end (the end that connects to the first phalanx of the fourth finger).
And this is the proximal end which connects to the distal carpal (wrist).
That’s only one metacarpal. I need three more for the small fingers. They run parallel to the big one and are connected through cartilage and muscles. But I will finish the humeri and radio-ulna pairs before making them.