The $U-$shaped bone present at the base of the buccal cavity is:

An elderly woman slipped in the bathroom and had severe pain in her lower back. After $X-ray$ examination,doctors told her it is due to a slipped disc. What does that mean? How does it affect our health?

Match the following columns:

Column-$I$	Column-$II$ (Number of bones)
$P$. Face	$I$. $6$
$Q$. Ear ossicles	$II$. $14$
$R$. Cranium	$III$. $1$
$S$. Hyoid bone	$IV$. $8$

In humans,the knob-like projection of the second cervical vertebra helps in the rotational movement of the head. What is it called?

In humans,the number of cervical vertebrae is . . . . . . .

Our vertebral column is formed by the