Embryology of the duodenum

Question 1

where does the duodenum begin?

Answer 1

just distal to the bile duct

Question 2

Why does it form a C shape?

Answer 2

because it is fixed to the stomach at the proximal end
and fixed to the midgut at the distal end
both are rotating in opposite directions

Question 3

Which way does the c loop rotates?

Answer 3

Rotates with the stomach so that the loop rotates to the right.