Which nerve extends from the knee down to supply the middle of the leg and the heel?

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The path and distribution of the tibial nerve fit this description. It branches from the sciatic nerve and travels down the back of the leg in the posterior compartment, supplying the calf muscles (like gastrocnemius and soleus). It continues behind the medial ankle and into the sole of the foot, where its branches provide sensation to the sole and the heel via the calcaneal branches. So it extends from near the knee down to the heel and supplies the muscles of the posterior leg as well as the heel area.

The other nerves don’t fit this pattern: the femoral nerve stays in the front of the thigh and doesn’t reach the heel; the saphenous nerve is a sensory branch of the femoral nerve that runs along the medial leg but doesn’t cover the heel or the posterior leg muscles; the radial nerve is in the arm.