Abstract
The content of K expressed relative to non-collagenous protein N is normal even 20 days after denervation of the extensor digitorum longus of the rat. Following denervation only the intracellular muscle phase decreases. The drop in K content (K/muscle) and fat-free dry muscle solids (weight/muscle) reaches 50%. At this time the extracellular space (Na/muscle, Cl/muscle) remains unchanged. Ion composition and dry muscle weight gradually return to normal after reinnervation and restitution of motor function.

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