Abstract
THE deep lumbrical muscles of the cat's hind foot are very small ones situated between the tendons of the flexor digitorum longus muscle. The first of these is supplied by only 4–10 α motor fibres, which we found to differ in rate of conduction and in the characteristics of the motor units they innervate. As in the caput mediale of triceps brachii of the cat1 and the inter-transversarius muscles of the rat's tail2, the fast α fibres innervate motor units with short contraction time and the slow α fibres motor units with long contraction time.
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