Considering the classification of bones by shape, how is this bone classified?

What is the insertion of the muscle at the pointer?

  Identify the structure labeled ” B “

Identify the muscle at “A”.

Identify the insertion of the muscle labeled “C”.

Identify muscle “C”.

Identify the cranial nerve at the pointer?

  Give the functional classification of the joint indicated by the arrow  

Identify muscle “D”.

Identify the bone marking at D.