Which option correctly describes the best position and action to palpate the gastrocnemius and soleus?

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Palpating the gastrocnemius and soleus is easiest when you have access to the posterior calf and the muscles are taut enough to feel. Positioning the patient prone gives direct access to the back of the lower leg, and dorsiflexing the foot lengthens and tensions the posterior calf muscles, making their muscle bellies more distinct and palpable as you run your fingers along them. This combination helps you feel the fibers of both muscles and distinguish their borders while the leg remains relaxed otherwise.

In other positions, access to the calf is more limited, or the muscles may be in a less favorable state for palpation. Dorsiflexion specifically helps by placing the muscles under tension, whereas plantarflexion would shorten them and can make the fiber boundaries harder to identify.