Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A) : The joint between the atlas (C1) and axis (C2) allows for rotation of the head.
Reason (R) : This remarkable flexibility is due to the saddle joint found between the C1 and C2.
In light of the above statements, choose the correct answer from the options given below.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

Both (A) and (R) are false.

answer is C.

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Detailed Solution

(A) is true but (R) is false.

The joint between the atlas (C1) and axis (C2) is known as the atlantoaxial joint. It facilitates the pivotal movement of the head, allowing for rotation. This pivotal motion is crucial for activities like turning the head from side to side.

The joint between the atlas and axis is a pivot joint. Pivot joints are designed to allow rotation around a central axis. In the case of the atlantoaxial joint, the dens (odontoid process) of the axis acts as a pivot, allowing the atlas to rotate around it. This configuration provides remarkable flexibility, contributing to the wide range of motion of the neck.

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