The retractor bulbi muscle of the cat does not contain multi-innervated slow fibres, and succinylcholine (suxamethonium), 1–1000 μg/ml, causes no contracture of the isolated muscle. However, succinylcholine in a concentration of 1 μg/ml causes a contracture of the isolated inferior oblique and rectus muscles of the cat eye.
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Bach‐y‐Rita et al. (1967) studied this question.
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