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The recruitment order of gamma‐motoneurones in the decerebrate rabbit.

1. The order of firing (i.e. recruitment order) of gastrocnemius medialis gamma‐motoneurones to natural stimulation of the limbs has been studied in the precollicular decerebrate rabbit. 2. Recruitment order was not invariable. However, when a fixed order occurred there was a significant tendency for neurones to be recruited in order of increasing axonal conduction velocity. The functional significance of this finding is discussed. 3. In the preparation used, many gamma‐motoneurones were spontaneously active. 4. Two types of gamma‐motoneurone were distinguished on the basis of their resting discharge characteristics and responses to natural stimulation. 5. A significant correlation between resting discharge frequency and axonal conduction velocity was found for gamma‐motoneurones that were predominantly excited by natural stimulation.