In birds,some of the vertebrae are fused to form:

The pelvic girdle of birds is attached to a complex structure formed by the fusion of the last thoracic,all lumbar,and the first few caudal vertebrae. This structure is called:

Nucleus pulposus is found in

The long shaft of a bone is called as:

What are $P$ and $Q$ in the given bones?
$\quad \quad P\quad \quad \quad Q$

Analogy type questions:
$(1)$ Striated muscles : Voluntary muscles :: Visceral muscles : .........
$(2)$ In the face : $22$ bones :: In the vertebral column : .......