The answer to this question goes back to Anatomy.
The front of our hand is innervated by the Median and Ulnar nerves which come from the lateral and medial cords of the brachial plexus.
However, the back of the hand is innervated mostly by the Radial nerve which comes from the posterior cord of the brachial plexus. The posterior cord carries the maximum number of nerve roots, that is, C5, C6, C7, C8 & T1.
The radial nerve provides cutaneous sensory innervation to most of the back of the hand so I guess it's better to check temperature with a nerve with maximum representative nerve roots. I assume if one or two roots are not working properly, say C8 & T1, the other roots from the same nerve will compensate for it.
The front of our hand is innervated by the Median and Ulnar nerves which come from the lateral and medial cords of the brachial plexus.
However, the back of the hand is innervated mostly by the Radial nerve which comes from the posterior cord of the brachial plexus. The posterior cord carries the maximum number of nerve roots, that is, C5, C6, C7, C8 & T1.
The radial nerve provides cutaneous sensory innervation to most of the back of the hand so I guess it's better to check temperature with a nerve with maximum representative nerve roots. I assume if one or two roots are not working properly, say C8 & T1, the other roots from the same nerve will compensate for it.