What is the sensory for S1 nerve root?

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What is the sensory for S1 nerve root?

Dermatomes map sensation to specific nerve roots. The S1 root supplies sensation to the posterior aspect of the lower leg and the lateral side of the foot, including the lateral border around the ankle. This pattern comes from how S1 fibers travel with the tibial and sural nerves to those regions. So numbness or altered sensation in the back of the calf and the lateral foot aligns with S1. In contrast, the medial leg and medial foot are typical for L4/L3, while the dorsum of the foot is usually L5, so those areas don’t fit S1 as well. Therefore, the distribution most consistent with the S1 nerve root is the lateral foot and back of the calf.

Dermatomes map sensation to specific nerve roots. The S1 root supplies sensation to the posterior aspect of the lower leg and the lateral side of the foot, including the lateral border around the ankle. This pattern comes from how S1 fibers travel with the tibial and sural nerves to those regions. So numbness or altered sensation in the back of the calf and the lateral foot aligns with S1. In contrast, the medial leg and medial foot are typical for L4/L3, while the dorsum of the foot is usually L5, so those areas don’t fit S1 as well. Therefore, the distribution most consistent with the S1 nerve root is the lateral foot and back of the calf.

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