True or false: if fibers derived from the anterior rami of from spinal levels S1 and S2 of the common fibular nerve were non-functional, plantarflexion of the foot at the ankle would no longer be possible. Explain your answer.
Plantarflexion would be affected, but only minimally. All of the muscles in the posterior compartment of the leg that plantarflex the foot (tib posterior, flexor hallucis longus, flexor diggitorum longus, gastroc, plantaris, and soleus) are innervated by the tibial nerve, not the common fibular nerve. Muscles in the lateral compartment of the leg also plantarflex the foot (fibularis longus, fibularis brevis), and are innervated by L5, S1, and S2. So they would be compromised, but likely still functional, since L5 and S1 are both primary.