Notophthalmus viridescensSalamandridaeExtremitiesRegenerationSpinal CordSpinal Cord InjuriesTriturusAmbystoma mexicanumSpinal Cord DiseasesSpinal Cord CompressionSpinal Cord NeoplasmsAmbystomaSpinal Cord IschemiaTurbellariaLimb BudsForelimbUrodelaAnimal FinsInjections, SpinalNotophthalmusPlanariansTailParaplegiaSpinal Nerve RootsSpinal Nerves