The central shaft of a long bone is known as

Read the following Assertion $(A)$ and Reason $(R)$ and choose the correct option.
Assertion $(A):$ All $12$ pairs of ribs are called bicephalic.
Reason $(R):$ Each rib is connected dorsally to the vertebral column by $2$ heads of articulation.

The number of bones in the human face is:

The human skeleton is divisible into which parts? Name them.

Which is the largest vertebra in mammals?

The number of bones in half of the lower jaw of man is