Question

Which of the following helps in rotation of the neck?
A.Atlas
B.Axis
C.Cervical
D.Occipital condyle of skull

Answer 1

Hint: The vertical column is also called backbone or spine. It is curved, vertical rod, about 70cm long, in the mid dorsal line of the neck and trunk .
It consists of a row of 33 movably articulated rings like bone called vertebrae.

Complete step by step answer:
-The vertebrae are grouped together into 5 categories
1.Cervical vertebrae
2.Thoracic vertebrae
3.Lumbar vertebrae
4.Sacral vertebrae
5.Coccygeal vertebrae
-Cervical vertebrae : this are seven in number and are present in the neck .The first cervical vertebrae is called atlas.it provides up and down or nodding movement to the skull on it
The second cervical vertebrae is axis it allows side to side or turning movement to the atlas and skull together .

So the correct answer is option is B.Axis

Additional information:
-Atlas is almost ring like .Axis centrum bears and the odontoid process.
-The cervical vertebrae are almost the smallest and allow the widest range of motion to let the head turn in many directions .
-They have apertures called foramina transversia in their transverse process.
-These foramina forms a channel called vertebrarterial canal, on either side for the vertebral artery to pass through the brain.
-Thus this important blood vessel is protected as it passes through the vulnerable region of the neck.

Note:
Atlas is also known as yes bone as the head can nod on atlas forward or backward. And axis is known as no bone as it supports the turning movement of the head.