Figure 1. (A) The Alzet osmotic pump body is 3 cm in length and 0.7 cm in diameter with a reservoir volume of 200 ml (shown with the attached 7-inch catheter). It was implanted subcutaneously between the scapulae of the rat. (B) Implanted osmotic pump (white oval shape). The black line represents the attached flexible catheter. A silicon Elizabethan collar prevented self-mutilation of the de-innervated foot (not shown). The strip represents the transected and repaired sciatic nerve.