What is the insertion of muscle “D”?

Identify the muscle at “B”. 

Identify the area labeled “C”

Identify the structure labeled “D  “

Identify the muscle labeled “C”.

Identify the structure labeled “A”

Identify the muscle at “B”.

Identify the structure labeled “A” on the wall mount above.

What is the function of the structure at Arrow C?

Identify the structure labeled ” C “