Abstract
The contractile properties of the rat masseter muscle were studied by direct stimulation of the muscle while in situ in the anaesthetized rat. The muscle was found to be a fast muscle with a contraction time of approximately 50 msec. Variation of the position of the lower jaw showed that the twitch tension, produced by discrete single stimuli, was greatest when the mouth was opened by about 8 mm from occlusion. This finding differs from that for voluntary biting power in the human subject.
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