The posterior cutaneous nerve of the thigh.
Loss of sensation to the sole of the foot would result from nerve blockade of the tibial nerve at the medial malleolus.
A sensory nerve carries sensory information to the nervous system. Sensory information is that which is coming from external stimuli such as pressure and temperature. If a sensory nerve is damaged, the person loses sensation in that region of their body. This explains why the patient cannot feel his fingers.
Thus, this could be the answer.
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